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v.audacity 356d0d2d03 Added missing spaces between words munged together. Made it not specific to release candidate, because the tests can be run any time. Changed "Google Code" to "the Audacity code repository", for clarity and generality. 10 years ago
dox2-src Added missing spaces between words munged together. Made it not specific to release candidate, because the tests can be run any time. Changed "Google Code" to "the Audacity code repository", for clarity and generality. 10 years ago
help provide an initial appdata file and associated rules 10 years ago
images Apply parts of a warning supression patch by Campbell Barton 10 years ago
lib-src Regenerate autotool files of libvorbis with a newer autotool version. 10 years ago
locale Update by Inácio Barroso. 10 years ago
m4 Added missing spaces between words munged together. Made it not specific to release candidate, because the tests can be run any time. Changed "Google Code" to "the Audacity code repository", for clarity and generality. 10 years ago
mac Create empty Otherwise, the 10 years ago
nyquist patch for (P4) 11 years ago
plug-ins Missing quotation mark was hiding most of the "help" info text. 10 years ago
presets More robust handling of default curves: 13 years ago
qa Added missing spaces between words munged together. Made it not specific to release candidate, because the tests can be run any time. Changed "Google Code" to "the Audacity code repository", for clarity and generality. 10 years ago
scripts strim out some references to minimal and complete tarballs as we only have one sort of tarball now 10 years ago
src Fix pointer calc as discussed here: 10 years ago
tests Project Check (DirManager::ProjectFSCK) test projects 13 years ago
win Add Audacity changes for new libflac 1.3.0. 10 years ago
LICENSE.txt Fix typo in our additional text. 12 years ago Remove the veryclean target. Use the distclean target and svn-clean instead. 10 years ago
README.txt Version for 2.0.5. 10 years ago
audacity.dox 2.0.4 is released. Onward with 2.0.5! 10 years ago Applying 2 of Benjamin's patches to add an autogen script and to 13 years ago
config.guess Locate and position the current Audacity source code, and clear a variety of old junk out of the way into junk-branches 14 years ago
config.sub Locate and position the current Audacity source code, and clear a variety of old junk out of the way into junk-branches 14 years ago
configure I'll get this darn thing right eventually! 10 years ago Make configure subdirectories in AC_CONFIG_SUBDIRS literal. 10 years ago
install-sh Locate and position the current Audacity source code, and clear a variety of old junk out of the way into junk-branches 14 years ago
todo.txt Remove more items already done, and add links to relevant current documents 11 years ago


Audacity(R): A Free, Cross-Platform Digital Audio Editor

We welcome feedback on Audacity, suggestions for new or improved features,
bug reports and patches at: .

Personal support with Audacity is not provided by e-mail, but on our Forum: .

Audacity is copyright (c) 1999-2013 by Audacity Team. This copyright notice
applies to all documents in the Audacity source code archive, except as
otherwise noted (mostly in the lib-src subdirectories).

The documentation for Audacity is licensed under the Creative Commons
Attribution 3.0 license: .

"Audacity" is a registered trademark of Dominic Mazzoni.

Version 2.0.5

Contents of this README:

1. Licensing
2. Changes since version 2.0.4
3. Known Issues at Release
4. Source Code, Libraries and Additional Copyright Information
5. Compilation Instructions
6. Previous Changes going back to version 1.1.0.


1. Licensing

This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version. The program source code is also freely
available as per Section 4 of this README.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
License for more details.

You should have received a copy of the GNU General Public License
along with this program (in a file called LICENSE.txt); if not, go
to or write to

Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307 USA


2. Changes since version 2.0.4:

Bug fixes for:

* Shaped dither was corrupted and too loud on all stereo exports except FLAC.

* Keyboard Preferences: some Edit and Align commands for different sub-menus
showed the same name.

* Recordings stopped with "Stop and Set Cursor" shortcut could not be undone.

* In locales that use comma for decimal separator:
* Text boxes with slider in Nyquist effects only produced whole numbers
when using comma to enter a fractional number. Text boxes without
slider still have this problem.
* Built-in generators produced silence after running a Nyquist effect.

* (Windows) When first changing to Windows WASAPI host, the input volume slider
in Mixer Toolbar was enabled when it should have been permanently disabled.

* (Windows) On some machines, launching Audacity then recording from the current
Device Toolbar input would not record until the input was reselected.

* (OS X) Frequent crashes occurred on importing audio files on some machines.

* (OS X) Files did not open using Finder "Open with", double-clicking the
file or dragging the file to the Audacity icon.

* (Linux 64-bit) Fixed a crash when using Equalization.

* (Linux) It was not possible to open an effect or other dialog then navigate
through the dialog using TAB.

* (Linux) The Play shortcut did not play a read-directly WAV, AIFF or FLAC
import if the warning for importing uncompressed files appeared.

Changes and Improvements:

* Tracks Menu:
* The separate commands that aligned track start or end with the cursor or
with selection start are combined into "Cursor/Selection Start" commands.
* "Align and Move Cursor" renamed to "Move Selection when Aligning".

* Label Tracks:
* Labels Editor now allows empty labels to be saved on closing the editor.
* TAB and SHIFT+TAB when the label track has focus now always move forwards
or backwards respectively to the nearest label.

* (Windows) On a very few machines, the Windows WDM-KS low latency audio host
introduced in Audacity 2.0.4 caused Audacity to hang or the computer to
crash. WDM-KS has been removed from 2.0.5 until it can be safely enabled.

* (Windows and OS X) Screen reader improvements for Install VST Effects dialog.

* (OS X) Audio Unit plug-ins detected by Audacity on launch are now not loaded
until chosen from the Effect menu. This should speed up launch and avoid
crashes at launch due to misbehaving Audio Units.

* (Linux) Update to PortAudio r1910 fixes memory and other bugs under ALSA.

* (Linux) Applied fix for wxGTK 2.8.12 bug which resulted in loss of Audacity's
menu bar (or visual corruption under Unity) on Debian-based systems.


3. Known Issues in 2.0.5:

For known issues at release of 2.0.5, please see:

Please also check:

for details of any issues that have been identified after release of
this version.


4. Source Code, Libraries and Additional Copyright Information

Source code to this program is always available; for more information visit
our web site at:

Audacity is built upon other free libraries; some of these libraries may have
come with Audacity in the lib-src directory. Others you are expected to install
first if you want Audacity to have certain capabilities. Most of these libraries
are not distributed under the terms of the GPL, but rather some other free,
GPL-compatible license. Specifically:

expat: BSD-like license.
Provides XML parsing. Included with Audacity.

FFmpeg: GPL or LGPL (according to how you obtain/configure it)
Provides decoding/encoding of additional formats. Optional separate

libid3tag: GPL
Reads/writes ID3 tags in MP3 files. Optional
separate download as part of libmad.

libflac: Xiph.Org BSD-like licence (the parts we use)
Decodes and Encodes Free Lossless Audio Codec files. Optional separate

libmad: GPL
Decodes MP3 files. Optional separate download.

libnyquist: BSD-like license.
Functional language for manipulating audio; available
within Audacity for effects processing.

libogg: BSD-like license.
Optional separate download, along with libvorbis.

libsndfile: LGPL
Reads and writes uncompressed PCM audio files.
Included with Audacity.

libsoxr: LGPL
The SoX Resampler library performs one-dimensional sample-rate conversion.

libvamp: new-style BSD
Plug-in interface and support library for audio analysis plug-ins.
Included with Audacity.

libvorbis: BSD-like license.
Decodes and encodes Ogg Vorbis files. Optional
separate download.

portsmf: BSD-like license.
library for reading and writing midi files. Included with Audacity

sbsms: GPL v2
Pitch and tempo changing library. Included in Audacity

SoundTouch: LGPL
Changes tempo without changing pitch and vice versa.
Included in audacity

Twolame: LGPL
Encodes MPEG I layer 2 audio (used in DVDs and Radio). Optional separate

wxWidgets: wxWindows license (based on LGPL)
Cross-platform GUI library - must be downloaded and
compiled separately.

For more information, see the documentation inside each library's
source code directory.

Additional copyright information:


Copyright (c) 2000-2002, by Roger B. Dannenberg
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.

Redistributions of source code must retain the copyright notice, the
list of conditions, and the disclaimer, all three of which appear below under

Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.

Redistributions in binary form must reproduce the copyright notice, the
list of conditions, and the disclaimer, all three of which appear below under
and/or other materials provided with the distribution.

Neither the name of Roger B. Dannenberg, Carnegie Mellon University, nor the
names of any contributors may be used to endorse or promote products derived
from this software without specific prior written permission.


Copyright (c) 1984-2002, by David Michael Betz
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.

Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.

Neither the name of David Michael Betz nor the names of any contributors may be
used to endorse or promote products derived from this software without specific
prior written permission.



5. Compilation instructions

First you must download wxWidgets. Audacity 2.0.5 requires wxWidgets 2.8.12
from: .

The libsndfile library is also required and is included in Audacity obtained
from SVN.

CMake ( ) is required to build the local copy of
libsoxr (Audacity's default resampling library) unless you install
libsoxr-dev and use that system library.

Installation of other libraries is optional, see: .

If you install libraries using a package management system like Apt or RPM,
you need to install the "dev" (development) packages for each library.

To compile on Linux, Mac OS X and other Unix systems, execute these

make install # as root

To see compile-time options you can set, you can type
./configure --help

If you want to do any development, you might want to generate a configure cache
and header dependencies:

./configure -C
make dep

To compile on Windows using MSVC++, please follow the instructions in
win\compile.txt in the source code.

To compile using Xcode on Mac OS X, see the instructions in mac/compile.txt.

For more information on compilation, please visit:

or ask at: .


6. Previous Changes going back to version 1.1.0

Changes in version 2.0.4:

Bug fixes for:

* Keyboard Preferences: Shortcuts for Generators, Effects and Analyzers
were not exported. All imported shortcut changes were discarded.
* Equalization curves were corrupted in Graphic EQ mode after switching
to/from Draw Curves or after running the effect then reopening it.
* Change Pitch displayed corrupted values when reducing pitch or editing
"from" Frequency. Detection was very inaccurate at high sample rates.
* Bass Boost no longer clips if the track contains 32-bit audio.
* Auto Duck was excessively slow on older machines.
* (Windows) Exported MP3 comments tags were not seen by Windows programs.
* (Windows and OS X) Audacity crashed if you used system quit before
file import was complete.
* (Linux) Equalization crashed Audacity if the XML file was corrupted.
* (Linux) When configuring effect parameters in "Edit Chains", "Preview"
(not intended to be functional) caused a crash.
* (Linux) LICENSE.txt and README.txt were wrongly installed in
/usr/local/share/doc instead of /usr/local/share/doc/audacity/ .
* Accessibility: ENTER did not toggle selectedness of a label track unless
a label was selected.
* Numerous other interface fixes.

Changes and Improvements:

* New "Reverb" effect to replace GVerb, based on the original "Freeverb".
* New View > Go to Selection Start and Go to Selection End commands.
* New "Align End to End" command to append existing tracks to each other.
* Change Tempo now supports fractional BPM.
* Plot Spectrum now supports FFT sizes up to 65536.
* WAV files now support "Album Title", "Track Number" and "Genre" LIST INFO
tags and also support ID3 tags.
* Handle a bug in older iPods or some OS X applications that cause them to
refuse AIFF files whose metadata contains an uneven number of characters,
* (Windows) Added support for "Windows WDM-KS" host which can provide very
low latencies if you reduce "Audio to Buffer" in Recording Preferences.
* (Windows Vista and later) You can now record computer playback by choosing
the new "Windows WASAPI" host in Device Toolbar then a "loopback" input.
* (Windows and Mac OS X): VST scanning dialog now replaced with a dialog
for choosing which VST effects to load.
* (Linux) CTRL + ALT can now be used to smooth samples in Draw Tool.
* Modules Preferences replaced with a dialog on launch of Audacity
enabling you to choose which modules to load.

Changes in version 2.0.3:

Bug fixes for:

* Crash using Undo whilst time-shifting a track.
* Crash using Repair if the selection extended into an empty track.
* Export Multiple didn't prevent export if there was no audio or
all audio was muted. This allowed export of small invalid files.

* Time Track:
* Loop Play of a speeded-up track inserted silence.
* Playback and rendering was significantly inaccurate, creating
audible and visual glitches.

* Accessibility:
* The mnemonics character "&" was read out by screen readers in
most of the Preferences choices.
* NVDA did not read static text in most dialogs. Text can now be
read by using INSERT + B.
* JAWS and Window-eyes misread the "Duration" control in Silence
* Toolbar buttons could not be pressed by ENTER

* Other interface bug fixes.

Changes and Improvements:

* The SoX Resampler library (libsoxr) has replaced libresample in
Audacity releases, offering both higher quality and greater speed. .

* Time Tracks new features:
* "Set Range" now changes only the range of the Time Track,
preserving the pitch/speed set by any existing warp points.
* Vertical scale added with options for linear and logarithmic
display and interpolation.
* Upper and lower speed limits will now be remembered when saving
and reopening a project in 2.0.3. Warp points in projects saved
by previous Audacity versions will be correctly restored in 2.0.3.
* Warp points saved in a 2.0.3 project will be preserved if opened
in previous versions but playback and display will be incorrect.

* New effects:
* Studio Fade Out (uses a filtered "S" curve).
* Adjustable Fade (accessible effect for creating partial fades
and adjustable fade shapes).
* Bass and Treble (replaces Bass Boost).

* Real sample rates up to 384000 Hz are now supported for playback
and recording in high resolution devices (the maximum is up to
192000 Hz for Windows DirectSound host).

* Labeled Regions in Edit Menu is renamed to "Labeled Audio" and now
allows splits to be placed at point labels. Labeled audio regions
that touch without overlapping are treated as separate regions.
Overlapping labeled audio regions are treated as a single region.

* Compilation: cmake is required in order to build libsoxr.

* New Croatian translation of Audacity.

Changes in version 2.0.2:

Bug fixes for:

* Interface:
* "Retain labels" Interface Preference did not retain labels for
a region that snapped exactly to both label edges.
* Projects did not save the track selected state.
* (OS X, Linux) Timer Record: Interlinking of the Start, End and
Duration controls was broken.
* (Windows) JAWS screen-reader did not read the "Draw curves" and
"Graphic EQ" radio buttons in Equalization correctly.

* Envelopes and Clips:
* Exporting (or any render operation) on a track containing
split lines could create clicks at the split lines.
* Dragging a clip into another track caused a crash if Sync-Lock
Tracks was enabled and there was also a label track.

* Effects and Analysis:
* Normalize could crash if the track name contained "%".

Changes and Improvements:

* Duration controls when generating at a point now default to
hh:mm:ss + milliseconds format. Selection Toolbar also defaults
to that format on first installation or resetting preferences.
* Toolbars visual improvements:
* "Snap To" in Selection Toolbar now has an explanatory tooltip.
* Device Toolbar tooltips now display the selected device.
* Increased default width of Device Toolbar and Meter Toolbar.
* Improvements and some bug fixes to Nyquist effects, including:
* Delay (new option to prevent duration change)
* Sample Data Export (new "L-R on Same Line" layout option)
* Risset Drum (new "Amplitude" slider).
* Importing a labels file writes the file name to the name of the
Label Track, and exporting a labels file offers the name of the
last Label Track in the project.
* Removed the "Audio cache" option from Directories Preferences
due to frequent crash reports. All data operations will now
be written to disk and not to RAM.
* Removed the FFmpeg "On-Demand" option from Libraries Preferences
(this fixes Audacity not building if configured --without-ffmpeg).
* Compilation: Progress on making the Modules feature mainstream.
Modules can now be individually enabled and disabled in Preferences.

Changes in version 2.0.1:

Bug fixes for:

* Interface:
* Selection Toolbar: a value for the previous whole second
displayed if the value was close to a whole second.
* Finding zero crossings could cause the selection to expand into
white space at either side of the clip.
* Clips did not drag to another track if mouse was over a selection.
* Mixer Board: Rendering four tracks resulted in a redundant Track
Strip followed by a crash.

* Imports, Exports and Files:
* Exporting to WAV or AIFF led to a "Libsndfile says" error or
corrupted output due to order of metadata in imported files.
* (Mac) Fixed crashes importing MP3 files on PPC machines.
* (Linux Ubuntu) .Aup files could not be associated with Audacity
(they opened in the web browser instead).

* Effects and Analysis:
* Normalize: Fixed issues where normalization could be to wrong
value if applied with DC offset correction, or if applied to
"read-directly" WAV and AIFF files before On-Demand completed.
* Sliding Time Scale: fixed an audible discontinuity at the
beginning of the processed selection; fixed a serious quality
problem on Linux 64-bit.

* Other miscellaneous bug fixes, including fix to prevent zooming
with mouse wheel or ball scrolling the content off-screen.

Changes and Improvements:

* Shortcuts can now be added in Keyboard Preferences to items in the
Generate, Effect or Analyze menus, including user-added plug-ins.

* Nyquist Effect plug-ins can now be added to Chains.

* New "Paulstretch" effect for extreme slowdown without pitch change.

* New "Sample Data Export" Analyze effect for exporting a file
containing amplitude values for each sample in the selection.

* New Preference (off by default) to import files On-Demand (without
seek ability) when using the optional FFmpeg library.

* New Preference (off by default) to retain labels when deleting a
selection that snaps to the label without extending past it.

* (Windows installer) New option to reset Preferences on next launch.

* (Mac) Audacity now has excellent compatibility with the VoiceOver
screen reader. For details, please see: .

* CleanSpeech Mode (no longer supported) will not now be enabled
even if it was enabled by an earlier version of Audacity.

* Added Serbian (Latin and Cyrillic) translations.

Changes between version 1.3.14 Beta and 2.0.0:

Bug fixes for:

* Interface:
* Fixed playback speed and synchronization problems when dragging
clips or tracks between tracks having different sample rates.
* (Windows) Removed a crash risk where shortcuts could be
used to record or import in one project while importing or
exporting in another.

* Imports and Exports:
* Fixed crashes when changing the sample format of read-directly WAV
or AIFF files using the Track Drop-Down Menu.
* Fixed a crash importing MP3 files that had duplicate metadata tags
(this is a bug in current libsndfile which has been patched in
Audacity; MP3 files mislabeled as WAV which have duplicate tags
will still crash Audacity on Linux if Audacity has been compiled
against an affected version of system libsndfile).
* Fixed an issue where excessively high or corrupted sample values in
the audio could corrupt exports from the start of the problem for
the rest of the file, and could corrupt the rest of the project.
* (Linux) Fixed Audacity could not be compiled against FFmpeg
0.7.x and 0.8.x.

* Effects and Analysis:
* Fixed crash on launch when using "Ambisonic Decoders (PC)" VST
plug-ins and other plug-ins that enable additional floating point
* Fixed Plot Spectrum background could be transparent on some machines.
* Bug fixes for Click Track, High Pass, Low Pass and Vocal Remover.
* Chirp, Tone and Silence generators now remember their settings.

* Other miscellaneous bug fixes.

Changes and Improvements:

* New Interface preference to show the track name in the display (this
is off by default).
* Longer default Playback preference for effects preview and preview
before cut.
* Restored use of Page Up and Page Down to scroll horizontally.

Summary of bug fixes and new features between 1.2.6 and 2.0.0:

* Bug Fixes:

* Labels now accept lower case "z".
* (Windows Vista/7) Pressing Stop after recording could cause a crash.
* (Mac OS X) Fixed shortcut keys activating when typing in file open or
save windows.
* (Mac OS X) Audacity 2.0.0 fully supports Unicode, which fixes an
issue where Audacity could not work with folders having non-English
characters in their name.
* (Linux) Playing existing tracks while recording in mono could cause
recordings to be distorted or low-pitched.

* New features: There are dozens of new features in 2.0.0, including:

* Many effects significantly improved, especially Equalization, Noise
Removal and Normalize. Vocal Remover now included plus GVerb on
Windows and Mac. VAMP analysis plug-ins now supported.
* Improved label tracks with Sync-Lock Tracks feature in the Tracks Menu.
Multiple clips per track. Tracks and selections can be fully
manipulated using the keyboard. Many more keyboard shortcuts.
* New Device Toolbar to manage inputs and outputs. Timer Record feature.
New Mixer Board view with per-track VU meters.
* Automatic Crash Recovery in the event of abnormal program termination.
* Fast "On-Demand" import of WAV/AIFF files if read directly from source.
FLAC now fully supported. Added support for optional FFmpeg library
for import/export of AC3/M4A/WMA and import of audio from video files.

Please visit for a full
list of features in 2.0.0. You can click Help > Manual (in web browser)
in the program to read more.

Changes in version 1.3.14 Beta:

Bug fixes for:

* Interface:
* Excessive delay occurred when typing into labels in long projects.
* Last digit of TimeText controls could not be manipulated in some formats.
* (Windows, OS X) Play and Record shortcuts did not work after clicking in
Device Toolbar.
* (OS X, Linux) Crash occurred if Toolbars were reset during playback or

* Imports and Exports:
* MP2 files were not importable without FFmpeg library or an import rule.
* Files that could only be imported using FFmpeg imported as noise with
no error message if FFmpeg was not available.
* Files containing PCM audio but an incorrect extension (such as MP3)
caused a freeze.

* Effects and Analysis:
* An empty command could be added to a Chain which then displayed a
Nyquist error message when run.
* Plot Spectrum didn't preserve signal level if multiple tracks were

* Other bug fixes:
* Audacity has been provisionally fixed so that it can no longer create
block files longer than the sample format or project format allows,
and can no longer delete these, which led to data loss. Any overlong
blocks found are preserved but "orphaned", so will appear as silence.
* Orphan block files were wrongly reported if cutting or copying to
the clipboard then reopening the project in the same session.
* Fixed some crashes and incorrect movement of audio when dragging tracks.
* (Windows) Data loss is now prevented when encountering a corrupted
.aup file created in ANSI builds.
* (Linux) Restore building if USE_PORTMIXER is not defined.

Changes and Improvements:

* Normalize: Faster processing and improved interface. Left-right balance
in unsplit stereo tracks is now preserved by default, with a checkbox
option provided to process stereo channels independently.
* Spectrograms now allow window sizes up to 32768 and frequencies up to
half the sample rate (the maximum possible).
* Mix and Render now preserves clip length by not rendering white space
between time zero and first audio, and preserves audio before time zero.
To retain silence before the audio starts, generate silence after render.
* Grouped some Edit Menu items into "Remove Audio" and "Clip Boundaries".
* CleanSpeech Mode removed from Interface Preferences (it still runs if it
was enabled in a previous Audacity but can only be turned off there).
* (OS X) Added support for AudioUnit MusicEffects (but no MIDI support).
* (Linux) Set the per-user files directory per the program name set in
* (Linux) Changed the default location of the Audacity temporary directory
to be in /var/tmp not /tmp, so preserving the directory between reboots.

Changes in version 1.3.13 Beta:

Bug fixes for:

* Interface:
* Cutting or copying from a track at a given sample rate into a track
at another rate resulted in speed-changed audio.
* Generating inside a clip could modify the clip length or create
spurious clips.
* Recorded stereo tracks were only half the height of imported or
generated stereo tracks. Imported stereo files had a "1" appended
to the track name.
* Edit > Region Save did not save the cursor position.
* (Windows) Projects crashed when clicking rapidly inside the interface
or when applying repeated effects towards the end of audio tracks.
* (Windows) Some Unicode characters could not be typed into labels,
or caused a freeze using some input methods.
* (OS X) Crash when quitting an empty project window, or when closing the
main project window while a progress dialog was on screen.
* Numerous other interface fixes including Dependencies dialog,
Keyboard Preferences and spurious lines drawn on waveform.

* Imports and Exports:
* Support added for later versions of the optional FFmpeg library up to
current FFmpeg HEAD. This should significantly improve FFmpeg support
on Linux. FFmpeg downloads for Windows and Mac updated to v0.6. This
fixes mono AAC files importing as stereo, though current 0.5 versions
of FFmpeg will still work.
* Both FFmpeg and LAME should now be properly detected even when other
versions of those libraries exist on the system.
* New warning (on by default) for importing uncompressed audio files.
Better error messages when read-directly uncompressed files are missing.
* Imported ID3v2 metadata tags were removed when exporting without the
Metadata Editor appearing (for example, when using an export command
in Chains). Note: As a result of this fix, ID3v1 tags must now be
written by exporting using (external program) and an installed LAME.
* U-Law/A-Law files with WAV headers now use the standard 18 byte fmt chunk,
so should now be recognised by most telephony applications.
* Variable bit rate MP3s exported using "MP3 Files" were larger than
necessary because using the bit reservoir was disabled.
* (OS X) Files imported from iTunes could create invalid characters in the
.aup project file, causing an error when re-opening the project. Note:
An error "reference to invalid character number" will still occur if
re-opening a project created in previous Betas that contains such
characters. To fix the issue, open a back-up copy of the .aup file in a
text editor, turn off word wrap, then in the line indicated in the error
message, remove the string of characters that starts with &# and ends
with a semi-colon (;).

* Other bug fixes:
* Nyquist effects: fixes for crashes, incorrect slider behaviour and better
support for backslashes, double quotes and Unicode characters.
* (Windows and OS X) Processing of VST effects was substantially slower than
in previous versions of Audacity.
* (OS X 10.5 PPC) A first-time installation of Audacity Beta would hang
on launch if VST effects were detected.
* (Linux) Recordings made with the pulse device crashed or stalled when
using overdub and/or software playthrough.
* (Linux) Play-at-Speed crashed at 0.08 speed or lower if Audacity was
configured with libsamplerate.

Changes and Improvements:

* Control Toolbar renamed to Transport Toolbar.
* Device Toolbar (on by default) now contains all input and output device
choices, including host and recording channels. Input/output choices are
no longer in Mixer Toolbar on Windows XP or some older operating systems.
New Transport > Rescan Audio Devices menu item to refresh the device list.
* New "Sync-Lock Tracks" feature (turned on in the Tracks menu) to allow
groups of audio and/or label tracks to retain synchronisation when the
track length changes.
* Equalization: New "Manage Curves" dialog for importing and exporting curves.
* Noise Removal: New "Sensitivity" slider to adjust the noise threshold, and
new option to isolate noise.
* New "Extended Import" Preferences for specifying different importers to
open specific file extensions.
* Improved Automatic Crash Recovery with all project changes autosaved.
* MIDI tracks can be vertically zoomed, time shifted and display bar lines.
Note: the channel selection buttons are not available in 1.3.13.
* (Windows and Linux) The window Close button and other system close or
shutdown commands now quit on closing the last window. File > Close now
always clears to a new, empty project.
* (OS X) Simpler installer with top-level "Audacity" folder.

Changes in version 1.3.12 Beta:

Bug fixes for:

* Imports and Exports:
* AAC files could not be exported at 48000 Hz
* When importing multiple native file formats using FFmpeg, all
files after the first reverted to using the native importer
* FFmpeg custom export window too large on 800 x 600 resolution
* Projects froze if files imported via On-Demand were no longer
* (Linux) WAV/AIFF exports were corrupted if overwriting an aliased
file which had been imported using the command line

* Labels:
* Cutting or deleting a region in the waveform and label track did
not move the labels in advance of the cut
* Incorrect behavior snapping to labels and boundaries when Snep To
was enabled
* Labels can now be reversed if included with the audio selection

* Other bug fixes:
* When using non-English languages, Generate effects truncated the
selected region
* Mice with high-precision scroll-wheels could cause a crash
* Changing recording preferences using the Transport menu did
not update the menu in other open projects
* (Windows 7) Clicking in a file open or save dialog caused files or
folders to disappear from the list, and file filtering was broken

Changes and improvements:

* A hover tooltip is now provided if the Mixer Toolbar input selector
cannot control the system slider for the selected input.
* More intuitive behavior when moving and resizing labels by dragging
* Support added for importing lists of files (LOF) containing relative
* Export Multiple: new option to use a numerical prefix before existing
label or track names; "Success" dialog now resizable
* New Equalization preset "Inverse RIAA", with new button to invert
other curves
* Timer Record now remembers last scheduled duration
* Meter Toolbar can now be made much narrower, and so more suitable for
vertical orientation
* New Preferences choice for "System" language which is used on first
run instead of asking user to choose language
* Warning now provided if WAV/AIFF exports are not successfully
* (Linux) Improved icon set in compliance with
Icon Theme Specification 0.6

Changes in version 1.3.11 Beta:

Bug fixes for:

* Imports and Exports:
* Bug when exporting partial selections caused too much audio to be
exported is fixed.
* Fix corrupt files exported through FFmpeg when metadata included,
(metadata is now exported correctly in M4A files)
* Prevent saving a new Audacity Project over an existing one as this
could corrupt both projects.
* Improved help for files that cannot be imported because the relevant
optional library is missing.

* Effects:
* Allow effects which change the length of the audio they work on to also be
applied to selected label tracks, thus keeping them synchronized.
* Fixed inability in Nyquist plug-ins to add labels to an existing label track
* (Mac) Equalization window was corrupted after Preview
* (Linux 64-bit) Fixed crash Generating Click Track

* Audio Devices:
* Fixed bug causing recording to stop short when the recording sample rate
is not supported by the sound device and libsamplerate is used for
* Fix crash when opening Preferences on a machine where there are no
available audio devices.
* Fixes for bugs using Timer Record and Sound Activated Recording

* User Interface:
* Sizes of some dialogs adjusted to ensure they fit on the screen.
* Fix for supposedly "hidden" items appearing on screen with large
* Various keyboard shortcut and translation fixes.

* Other bug fixes:
* Several timing-dependent crashes and minor incorrect behaviors have been
* Windows installer now installs correctly over previous versions of Audacity

Changes and improvements:

* (Windows) Better icon file with higher resolution and transparency
* New SoundFinder plug-in to label regions of audio between silences, so
allowing silences between tracks to be excluded when exporting multiple

Changes in version 1.3.10 Beta:

Bug fixes for:

* Imports and Exports:
* Freeze importing audio files when Default View Mode set to
Pitch (EAC)
* Simultaneous On-Demand imports sorted incorrectly
* WAV or AIFF files imported as noise if Preferences set to
copy in the data at 24-bit quality
* WMA exports corrupted if they contained metadata
* Metadata Editor appeared before the Export window when
exporting to any format

* Effects:
* Crash or hang using Equalization on longer tracks
* Reverse did not reverse clip boundaries
* Nyquist:
* Excessive memory consumption led to slow processing or
* Values appearing in Nyquist effects text boxes were not
always the default or previously entered values
* Errors running Nyquist effects in European locales where
comma used as decimal separator
* VST effects remained in Effect menu even when re-scanned and
no longer available
* Truncate Silence produced incorrect results if silences
spanned a block boundary

* Other bug fixes:
* Spurious "not writable/disk full" errors when saving projects
* Playing, rendering or exporting multiple tracks led to
desynchronised playback or loss of audio data
* Crash opening Preferences when no recording and/or playback
devices enabled or connected
* Preferences window: OK button did not respond to ENTER when
a tab selected in left-hand panel
* Mixer Board solo button handling
* (Windows) After a period launching correctly, Audacity
sometimes did not come up on top at launch
* (Mac OS X) Correctly installed Help folder could not be found
* (Mac OS X and Linux) Output slider could affect VU playback
meter which then did not reflect actual waveform volume level
* (Linux) Undoing or redoing a label edit could cause a crash

Changes and improvements:

* Linked audio and label tracks disabled until a future Beta
version so they can be bug fixed
* Input volume slider will be disabled if it doesn't have proper
control of system slider; use the system slider instead
* Proper support for copying/pasting label-with-audio including
label text; new Edit > Paste Text to New Label menu item to
paste system clipboard
* Contrast Tool now modeless, more intuitive handling of multiple
project windows, various other minor improvements

Changes in version 1.3.9 Beta:

Bug fixes for:
* Crash, slow launch or excessive CPU/memory use arising
from automatic VST support:
* VST instrument plug-ins should now be correctly ignored
* VST effects now scanned only at start of first session
that detects them, then cached; effects are now not
loaded or opened until needed
* New "Effects" tab in Preferences to enable/disable VST
effects and enable VST rescan on next launch
* Default View Mode now works
* Chains now always apply their stored parameters rather than
those last used in Effect menu
* Non-MP3 files imported via drag or Recent Files caused
crash if filter in file open window set to MP3
* AAC exports (using the optional FFmpeg library) were
* Generating audio always fitted the project in the window;
fit now done only if generating in new track
* View menu items/shortcuts incorrectly disabled when playing
or recording
* DTMF generator defaulted to zero duration on open
* Unwanted interactions between linked audio and label tracks
* Noise Removal shifted clips if the selection region included
white space
* (Windows XP) Failure to launch on some machines due to
"incorrect configuration" issue
* (Windows) Crash importing a stereo file while a screen reader
such as JAWS is running
* (Mac OS X):
* Audio Units effects applied to all tracks in project even
if not selected
* QuickTime importer now handles files greater than 16-bit
or 64000 Hz
* Various other interface bugs

* Compressor: new option to compress based on peaks, improved
attack and decay time support
* Mixer Board: improved design, more responsive meters and
now interacts fully with Track Panel in main window

Changes in version 1.3.8 Beta:

New Features:
* Effects and Analysis:
* VST Effects now display GUI by default
* Faster Equalization and Noise Removal; improved
Truncate Silence and Click Track
* Chains applied to files now clear temporary data after
processing each file
* Updated Nyquist implementation with support for SAL
syntax and improved memory management
* Plot Spectrum now analyzes up to 237.8 seconds of audio,
with separate windows for each project and improved
display; new preferences for Spectrograms
* Contrast Analysis tool now modeless for easier use
* Interface:
* Draft Manual/Quick Help included in Windows and Mac
* New "Mixer Board" view with per-track VU meters
* Mute, solo, gain, pan and track height saved in projects
* More compact Preferences window with easier-to-use Keyboard
tab and new toolbars shortcuts
* New Screenshot Tools and improved screen reader support
* Other:
* Record more than 16 channels (hardware/drivers permitting)
* Improved support for non-mmap ALSA devices such as PulseAudio
* 32-bit float data over 0 dB now handled without clipping
* "Stop" option when importing preserves already imported data
* AMR NB import/export now supported if the optional FFmpeg library
is installed
* Faster waveform drawing and better response in multi-track

Bug fixes for:
* Export Multiple: failed with no export or warning if empty
label encountered; silenced project and exported files if
overwriting imported WAV files without copying the data in
* Metadata Editor hidden if it was on a now unavailable second
* Misaligned audio after "Split New" or Noise Removal effect
* Incorrect label movement and paste with linked audio and label
* Equalization, Cut Preview and Advanced Mixing Options dialog
* (Linux) Mixer Toolbar should now adjust levels and select input
sources properly
* "Audio cache" preference caused crashes - data is now only
cached in memory if available RAM is above a level defined
in preferences
* Various other crashes

Changes in version 1.3.7 Beta:

Cross-platform Bug Fixes:
* Muting/soloing caused incorrect channel results in exported
stereo files
* Noise Removal and all Nyquist effects pasted the original
unmodified audio at the end of the modified region
* Noise Removal inserted a tail of low level noise at the end
of the modified region
* Nyquist and Compressor plug-ins did not display moving bars
in progress dialog and over-estimated "Remaining Time"
* Cancelling Nyquist effects deleted unprocessed audio
* Change Speed and Change Tempo failed to modify the original
selection length
* Cut lines invisible
* Fixed various bugs importing multi-stream files via FFmpeg
* File > Export as WAV could be corrupted if overwriting
an imported WAV read direct from the file
* Export multiple "Other uncompressed files" choice always
produced 16-bit PCM audio irrespective of chosen options.
* MP3 export usually produced a 128 kbps constant bit rate file
irrespective of chosen options; reported length often
* MP3 ID3 Genre tag misread on import if the genre list in
Metadata Editor was opened and saved
* Exported metadata tags in MP3, OGG and FLAC often not seen by
player software - now substantially improved
* WMA exports (via FFmpeg)corrupted if metadata tags included
* Some multi-channel recording devices that previously recorded
more than two channels no longer did so
* Generated audio did not fit in window
* No warning was given when saving an empty project
* Beep on completing longer process did not work on many
* fixed crashes importing lists of files (.LOF), in Meter Toolbar
and Change Speed

Platform-specific Bug Fixes:
* Windows Vista: crash opening Preferences with no sound
devices enabled and connected
* Mac OS X and Linux:
* Spurious clipping at start of playback
* Labels did not accept certain legal characters
* Shortcuts did not work after running effects
* Project Rate did not change to respect rate of first
imported file if that rate was unsupported
* Mac OS X only:
* Crash resizing project window
* Menu items became inactive or visibly corrupted
* File > Open dialog did not always work on OS X 10.4
* Impossible to set independent Command and Control
shortcuts that shared the same key
* Freeze importing uncompressed files via On-Demand
(please report any remaining instances of this to:
* Portable settings were not picked up, instead settings
were taken from the default location
* Fixed unavailability of FFmpeg installer

New Features:
* F11 Full Screen mode
* High-quality "Sliding Time Scale/Pitch Shift" effect
* Audio Contrast Analyzer for testing audio on the
internet for WCAG2 accessibility compliance.
* Windows: sound devices can now be opened using the
more efficient DirectSound API

Other changes:
* Latency correction should be improved for many users
by employing a fixed rather than variable correction
* Grouping of Effects into categories turned off until
a way is added for users to do so themselves
* Numerous minor interface improvements such as Metadata
Editor navigation, new "hh:mm:ss + hundredths"
selection format
* Note: Windows users wanting to export MP3 files will
require the latest version of the LAME encoder from

Changes in 1.3.6 Beta (since 1.3.6a6 Alpha):

* "Save Compressed Copy of Project" saves in much smaller .OGG
format to facilitate online transmission of projects
* Improved MIDI import and export routines, and clearer color
for selection region
* Default temporary directory on Mac now accessible in Finder

Import / Export:
* Stability improvements in on-demand loading
* FFmpeg: support for latest version of library, improved
version checks and error messages, stability improvements
in custom exporter

Bug Fixes:
* Crash in "Get Noise Profile" step of Noise Removal at project
rates below 20480 Hz.
* Underestimation of peak level in tracks with a small number
of different peaks
* Truncate Silence could result in repeated or lost audio if
applied to the whole of a track
* Other interface, generating, exporting and platform-specific

* Added autoconf macro archive to CVS, enabling *.nix users
without this archive to build --with -MIDI

Changes in 1.3.6a6:

* Note Track now supports export as a MIDI file
* Linked audio and label tracks: improved support when source
and target number of tracks differ and when cross-pasting
different track types

Import / Export:
* On-demand now supports project saving during summarising;
reverts to stripey background; fixed some crashes due to
threading issues
* Exports: Single AAC filter (M4A LC profile) with quality
settings slider; removed FFmpeg formats already supported
by Audacity; added explicit GSM 6.10 (WAV) filter; current
project rate now used for all exports, with check for
format-invalid rates; improvements to metadata support

* LV2 plug-ins: added support (OS X and Linux only) for using
synths as tone generators, scale point labels, grouped
controls and i18n translations

Changes in 1.3.6a5:

* Note Track now builds on Windows
* Fixes/improvements for linked audio and label tracks (one
desynchronisation bug remains when pasting audio into a
greater number of tracks than were copied); now supports
label shifting when changing pitch and tempo
* Added full label pasting support: now possible to paste
multiple labels, region labels and labels with audio, and
correct label text is now pasted

Import / Export:
* Added full "on-demand" support (now with minimum file
length of 30 seconds): clicking moves summary calculation
point; supports split and merge of stereo tracks;
incompletely summarised tracks resume summary calculation
automatically; text-based Status Bar progress indication and
animated dummy waveform instead of embedded progress bar

* Fixed a bug where previewing Equalization curves more
than once previewed the unmodified audio
* Improvements to DTMF generator

* Improved support for working with audio in excess of 2^31
samples (about 13.5 hours at 44100 Hz); some accessibility

Changes in 1.3.6a4:

* New Preference: Default View Mode, to choose type of
waveform, spectrum or pitch view for new tracks
* Note Track: experimental support is now enabled by defining
USE_MIDI in config*, but does not build out-of-the-box
on Windows
* Bug fixes for linked audio and label tracks; now supports
label shifting when changing speed and generating tones

Import / Export:
* Improvements/fixes for AAC exports including new M4A
filter for compatibility with iTunes; RealAudio export
support removed - FFmpeg does not support this properly
* Improved refresh of on-demand loading; fixed a phantom
on-demand progress bar when time-shifting clips

* Experimental support for LV2 plug-in architecture on Linux
and Mac, but operation may be buggy; no LV2 support yet on
Windows, because the required slv2 library currently does
not build

Changes in 1.3.6a3:

Import / Export:
* Experimental support for exporting a much wider range
of proprietary audio formats via FFmpeg
* "On-demand" immediate loading of imported PCM WAV or
AIFF files now has experimental "progress bar" embedded in
the waveform until fully loaded

* Note Track: experimental support for cut, copy and paste
using Edit Toolbar; currently not available for Linux, where
EXPERIMENTAL_NOTE_TRACK must be undefined in order
to build
* New Transport menu for alternative access to play and record
commands and some recording preferences
* Audio tracks are now linked to label tracks by being positioned
above a label track, if linkage is enabled in the Tracks menu

Changes in 1.3.6a2:

Import / Export:
* Experimental support for importing a much wider range
of audio formats via FFmpeg: support has to be enabled
in *config when building and requires FFmpeg libraries
* Experimental support for "on-demand" immediate loading
of imported PCM WAV or AIFF files (full waveform continues
to load while you play or edit).

* Built-in plug-ins now grouped into related hierarchical

* New Debug Log window available in all builds
* Experimental support for linking a label track with any
number of audio tracks so that labels shift with cuts and
inserts in the audio track
* Default theme now reverted to that of 1.3.5
* Recording channels preference now defaults to stereo

* Bug fixes for shortcut availability/tab order in Selection Bar,
and for window focus issues when previewing effects
* Improvements in escaping and navigating fields in dialogs,
and in stability when screen readers are used

Changes in 1.3.6a1:

* Further improvements to menu navigation and wordings.
* All file dialogs are now resizable, and support "Places"
sidebar on Windows 2000 or later.
* Preferences:
* New "Theme" preference for modifying interface
colours and images, with experimental new default
colour scheme.
* New "Smart Recording" preference automatically pauses
recordings that fall below a pre-defined input level.

* Simplified modular builds for Windows, removing
static-linked configurations.
* New shared configurations on Mac to support modular
builds, and all builds are now Unicode.

* Default auto save interval reduced to 2 minutes.
* Bug fixes to correct project rate initialisation on Linux, and
file importing issues on PPC Macs.

Changes in 1.3.5:

Recording / Playback:
* Several bugs fixed so that latency correction should be better, and more
devices work correctly. Problems with invalid sample rates under Linux
should be much rarer.
* Newer version of Portaudio library.
* New feature to record onto the end of an existing track
(hold Shift while clicking Record).

Import / Export:
* Updated versions of Libogg, Libvorbis, Libflac, Libsndfile and Twolame
* Handling of unsupported file formats more informative.
* Handling of file names with slashes on OS X improved. New dialog
allows replacement of illegal file name characters on all platforms.

* Improved scaling and layout for rulers and VU meters.
* Envelope fixes/improvements including full control of undo/redo.
* New keyboard shortcuts and improved menu navigation.
* Preferences: More intuitive tab arrangement. New options for
mute/solo and Metadata Editor behavior. Language can now be
changed without restart.
* Expanded Build Information tab.

* New Vocal Remover plug-in, improvements for Generate effects.

* Fixes when building Audacity with libraries disabled.
* Improvements to make Mac and Solaris builds easier.

* Full fix for issue CVE-2007-6061 on systems where temporary directories
can be changed by other users (thanks to Michael Schwendt).

* Updated translations for many locales.
* Several stability improvements.

Changes in 1.3.4:

New Features
* New Welcome Screen with introduction to Audacity
* Enhanced Windows Shell integration, so Audacity shows up in lots of
Windows places such as "Open With".
* New keyboard command: 'Mix and Render to New Track'
(bound to Ctrl+Shift+M).
* New keyboard shortcut: "Shift-A" starts playback when stopped,
or performs "Stop and Select" when playing.
* Added support for VAMP audio analysis plug-ins.
* Solo button solos only one track at a time, and a track cannot be both
mute and solo.

* Keyboard shortcuts for making short/long jumps along the timeline.
* Added 'Snap To' in the Selection Bar.
* Made keyboard navigation easier when multiple menu items with the
same first letter exist.
* Enhanced interface for label editing.
* Layout of OK/Cancel buttons consistency improved.
* Preferences:
* "Select all audio in project, if none selected" (on by default)
* "Beep on completion of longer activities" (system bell, not
main output).
* Other preferences cleaned up and explanations improved.
* Envelopes: Many fixes when copying / pasting / repeating.
* Many translation updates.
* Track height fixed in several cases.
* CleanSpeech mode switching without closing and re-opening fixed.

Opening/saving formats:
* Metadata editor added for OGG, FLAC and WAV/AIFF exports, and
general improvements in this area.
* Import of metadata improved.
* Muted tracks are no longer audible in the exported mix.

* Truncate Silence: support for multiple and stereo tracks.
* Dtmf Generator:
* added support for keypad letters
* added an amplitude control.
* Compressor: variable decay time added.
* Equalization:
* Clicks at start / end prevented
* Improvements to saved curves being found
* Preview works correctly
* 'Merge' command appears in Undo history.
* Clipping detected more reliably.
* Nyquist plug-ins reviewed and enhanced.
* Better (and more) progress bars.
* Cancelling effect always restores previous audio.
* Several improvement to effects in batch mode.

Recording / Playback:
* Improvements to latency correction.
* Updated version of portaudio-v19 library.

Note that Help is no longer built in, but accessible on the Web via links
in Audacity.

Changes in 1.3.3:

Opening/saving formats:
* Import
* Import of audio from QuickTime (mov, aac, m4a) files is now
supported on OS X.
* Broadcast Wave Format (BWF) wave files can now be imported.
* Export
* Metadata can be added to OGG files
* Improved export option selection
* Additional export options added to MP3 and FLAC file formats
* Command line exporter now supported on Windows and OS X

* EQ effect
* Responsiveness improved.
* Several enhancements added.
* Batch support added.
* New Auto Duck effect
* Added previewing to AudioUnit effects
* Much improved Noise Removal effect
* Effects previewing can now be canceled
* New DTMF Tone Generator effect
* Additional options available in Noise effect
* Improved the Tone Generation effects

Other features:
* Major speed improvement in Spectrogram rendering
* Increased support for drag and drop on OS X
* Support added for building against wxWidgets 2.8
* Support opening multiple Audacity Projects at once from Explorer on
* Improved main window sliders
* New support for snapping while selecting and sliding
* Improved track focus handling and visual feedback
* Speed improvements and handling of resizing/zooming in tracks
* Spectrum view can now be zoomed.
* New internal file cache to improve handling of project files over

* Many improvements to language specific translations
* Numerous stability improvements

Changes in 1.3.1 and 1.3.2:

o Improved accessibility for the visually impaired
+ Improvements for screen readers, accessibility of
tracks, and hot keys
o Usability improvements
+ New selection bar
+ New features for label tracks
+ Improved toolbar docking flexibility
+ Menu renaming and reorganization
+ Selection, ruler, and playback control improvements
o Auto-save and automatic crash recovery
o Many bug fixes and stability improvements
o Major improvements to some built-in effects (Repair, Equalization)
and fixes to others
o New features and bug fixes for Nyquist
o Restructured Preferences dialog
o Improved batch processing
o File format export improvements
o Timer recording
o Intel Mac support

Changes in 1.3.0:

New features
The new features in Audacity 1.3 have been grouped into the
following six major categories.

1. Collapse/Expand Tracks
In Audacity 1.3, every track has an upward-pointing triangle at
the bottom of the label area on the left side of the track.

2. Multiple clips per track
In Audacity 1.2, there is one audio 'clip' per track. There is
no easy way to time-shift part of a track without moving the
rest. In Audacity 1.3, you can split a single track into multiple
clips. You can move these clips around between different tracks,
making it easy to construct complex compositions out of hundreds
of smaller audio samples.

3. Selection Bar
In Audacity 1.2, the current selection is contained in a
status bar at the bottom of the window. In Audacity 1.3,
this is replaced by a fully functional Selection Bar, which
displays and controls the current selection (your choice of
Start and End, or Start and Length), and the current audio
position. The selection bar is fully editable - just click
in any field and type to change the current selection precisely.
In addition, many formatting options allow you to view times in
different units, such as samples, CD frames, or NTSC video frames.

4. Improved Label Tracks
Label Tracks are Audacity's way for you to create markings 3
and annotations within your project. In Audacity 1.3, Label
Tracks are much improved, with support for overlapping labels,
and support for modifying both the left and right edge of the
label region just by clicking and dragging.

5. QuickTime and Audio Units on Mac OS X
On Mac OS X, Audacity can now import and audio file supported
by Apple's QuickTime technology. This includes .MOV and .MP4
(AAC) files. Unfortunately encrypted audio files (such as
those from the iTunes Music Store) cannot be imported directly
into Audacity - Apple does not allow this to be done easily
because it would be too easy to circumvent the encryption this way.

Also on Mac OS X, Audacity now supports Audio Unit plug-ins.
Audacity searches for Audio Units in the usual location, in the
system or user's Library folder.

6. Other features
Better performance with large projects

Project integrity check on open

Transcription toolbar



Cut lines


Changes in 1.2.4:

* The File menu now includes a list of recent files.

* The "Generate Silence" effect now prompts for a length.

* Audacity is now built with Vorbis 1.1, which features better encoding
quality and file compression.

* Dragging sound files into the Audacity window now works on Mac OS X
and Linux, as well as Windows. (Before, it worked only on Windows.)

* The "View History" window can now discard old undo levels to save disk
space on Windows. (This previously worked only on Linux and Mac.)

* "Preferences" command is now in Edit menu.

* "Plot Spectrum" command is now in Analyze menu.

* Opening a project file saved by a later version of Audacity displays
an intelligent error message. Also, trying to import a project file
(instead of open it) displays an intelligent error message.

* Audacity now compiles in Visual C++ .NET 2003.

* Other minor bug fixes.

* New or updated translations: Arabic (ar), Czech (cs), Finnish (fi),
Hungarian (hu), Japanese (ja), Norwegian (nb), Slovenian (sl),
Simplified Chinese (zh_CN), Traditional Chinese (zh_TW).

Changes in 1.2.3:

* Fixed a bug that caused recording to stop or display incorrectly
after about 50 minutes on some Windows systems. (This was partly
fixed in Audacity 1.2.2, but still didn't work on some systems.)

* The Change Pitch and Change Tempo effects have been upgraded to
use a new version of the SoundTouch library by Olli Parviainen,
with better speed and higher quality.

* libsndfile has been upgraded to version 1.0.11.

* Fixed a bug that caused the program to run slowly when using the
Envelope tool.

* Shift-clicking on a mute or solo button now un-mutes (or un-solos)
all other tracks.

* Nyquist plug-ins can now accept strings as input. Also, a "Debug"
button has been added to Nyquist effect dialogs, which allows you
to see all of the output produced by Nyquist, for aid in debugging.

* When the audio file referenced ("aliased") by an Audacity project is
missing, Audacity will now always play silence. Before, Audacity
would sometimes repeat the most recent audio that was played previously.

* VU Meters will now always reset when audio I/O has stopped.

* Fixed a major Mac-only bug that was causing Audacity to crash at seemingly
random times, but especially during audio playback and recording.

* New or updated translations: Italian (it), Hungarian (hu),
Ukrainian (uk), Spanish (es). Polish (pl), Simplified Chinese (zh),
Norsk-Bokmal (nb), French (fr).

Changes in 1.2.2:

* VU Meters added for both playback and recording. Click on
the recording meter to monitor the input without recording.

* Export Multiple - new feature that lets you export multiple
files at once, either by track, or split based on labels.

* Attempt to automatically correct latency in full-duplex recordings.
(This does not work perfectly, and is not yet supported on all
systems. It will improve in future versions.)

* Fixed a serious bug that could cause data loss when you save and
then reload and re-edit an Audacity project containing repeated
or duplicate data.

* MP3 tags dialog will only pop up the first time you export as
MP3; after that it will not pop up again as long as you have
filled in at least one tag.

* You can now add a label at the current playback position - in
the Project menu, with a shortcut of Ctrl+M.

* Clicking on a label now selects all of the tracks, making it
easier to use the label track to recall selections.

* Windows: Fixed a crash in the Time Track "Set Rate" command.

* Fixed a bug that caused problems with recordings over 45 minutes
on some Windows systems.

* Mac OS X: Improved support for the Griffin iMic by fixing a bug
that was causing it to always record in mono instead of stereo.

* Added support for Software Playthrough (listen to what you're
recording while recording it, or while monitoring using a VU
meter) - this makes it possible, for example, to record using one
audio device while listening to it play through a separate device.

* Unix/Linux: Fixed freeze caused by captured mouse when audio
device hangs. (Audacity may not respond, but it will no longer
freeze all of X.)

* Fixed a cosmetic bug that caused improper waveform display if
you tried to open an Audacity project saved on a different
platform (e.g., copying a project from a Mac to a PC).

* Fixed bug that could cause instability when pasting, splitting,
or duplicating a label track.

* You can now change the font of a label track by choosing "Font..."
from the label track's pop-up menu.

* Basic printing support has been added. Currently it scales the
entire project to fit exactly on one page. Try printing in
landscape orientation for best results.

* Mac OS X and Windows: Audacity ships with a newer version (1.0.1)
of the Ogg Vorbis encoder. Vorbis compression will now have higher
quality and smaller file sizes.

* Fix a bug that occasionally caused crashes when applying effects
to split tracks.

* Zoom In / Zoom Out now properly disable when they're not available.

* Fixed disk memory leak in Preview

* Other minor bug fixes and performance improvements.

Changes in 1.2.1:

* The following translations have been added or updated: Finnish,
French, Hungarian, Italian, Japanese, Norwegian, Polish, Russian.

* Fix a bug that could cause data to be lost when pasting audio
from one project into another, after the first project has been
saved and closed.

* Fix a possible crash when opening or resizing the Equalization
window, especially when using large system fonts.

* Don't allow percentages less than -100% in Change Pitch/Speed/Tempo
effects (fixes a possible crash).

* Fix a crash when the temporary directory is not available on startup.

* Correctly load ID3 tags saved in Audacity project files.

* On Linux and OS X, store lockfiles in the temp directory instead of
the user's home directory. This fixes problems in lab environments
where users have restricted or network-mounted home directories.

* Fix a bug that prevented Nyquist effects from running when certain
regional settings were activated.

* Fix a bug in the Quick Mix command that could cause old temporary
files to not be deleted.

* Linux: Fix endianness problems in playback on PowerPC.

* Linux: Fix compilation problem in Nyquist on MIPS.

* Linux: Include a more recent PortAudio v19 snapshot (fixes compilation
problems when building with the --with-portaudio=v19 option).

* Two new Nyquist plug-ins: "Cross Fade In" and "Cross Fade Out."

* Other minor bug-fixes.

Changes in 1.2.0:

* New cross-fade effects.

* Fix problem where samples were drawn in the wrong position
when zoomed all the way in. This caused the drawing tool
to move a different sample than the one under the cursor.

* Don't use id3v2.4 tags, which are not yet supported by
most players. (This was fixed in 1.2.0-pre2, but appeared
again by accident in 1.2.0-pre3.)

* Correctly display translated messages in the status bar.

* When the cursor is on-screen, the Zoom In button now zooms
to the area around the cursor.

* Mac OS X: Fixed audio problems on the Apple PowerMac G5.

* Linux/ALSA: Work around a bug in ALSA's OSS emulation that
caused Audacity's playback cursor to move too quickly.

* Microsoft Windows: The Audacity source code should now
compile out of the box on Windows.

* Many new/updated translations.

Changes in 1.2.0-pre4:

* Fixed problems that could occur when importing certain
non-seekable PCM audio files, such as GSM610.

* Fixed bug that was causing the samples to shift off-screen
horizontally when zoomed in very far and the track had a
time-shift offset.

* Fixed bugs in the new resampler that added noise to resampled
audio on some systems. If you experienced noise when exporting
to a WAV, MP3 or OGG file you may have been bitten by this bug.

* Fixed bug that led to occasional crashes when using the
time-shift tool in conjunction with high zoom factors.

* Dithering is now only applied on export when it is really
necessary (e.g. when converting float samples to 16-bit).

* Files that only contain mono tracks are now automatically
exported to stereo files when they contain tracks which are
panned to the left or the right.

* The Delete key can now be used to delete the current selection,
in addition to the Backspace key.

* Fixed bug where Audacity didn't ask whether to save
changes if you close the project or exit while recording.

* Mac OS X: Supports Playthrough (listen to what you're recording
while recording it) if your hardware device supports it.

* Mac OS X: Audacity is now a package (you can right-click on and select 'Show Package Contents'). Launch time
has improved significantly.

* MS Windows: Fixed problem that caused Windows XP to use
the short name of a file ("TESTFI~1.AUP"), which led to
problems when the file was later opened again using the
long file name.

* MS Windows: Fixed bug that caused file exports to fail
if the destination directory was the root folder of a
Windows drive.

* MS Windows: Audacity's application information which
is written to the Windows registry now always contains
the full path to the executable.

* MS Windows: Fixed problems in trying to set the Windows
registry as non-admin user, for file-type associations.

* Make sure the "Save" command is enabled after changing
gain and pan sliders.

* Updated translations. Added translator credits to the
"About" window in localized versions.

Changes in 1.2.0-pre3:

* Fixed bug where Export is grayed out when nothing is

* Fixed crash caused by opening Audacity on a computer with
a high-end sound card with no mixer support.

* Fixed crash in Import Raw.

* Fixed New Stereo Track.

* Cosmetic fixes for Mac OS X.

* Support for the VST Enabler on Windows added.

* Fixed crash if you close Audacity while the Preferences
dialog is open.

* Fixed duplicate-character bug in Mac OS X Label Tracks.

* The recording level control on Linux now adjusts the IGAIN,
rather than the playthrough level of the recording source.

* Fixed bug that caused corruption to 16-bit stereo recordings.

* Fixed bug that caused data loss if you deleted all tracks in
a saved project and then open a new file into the same window.

* Added support for alternate audio button order (in Interface

* Added preliminary support for wxX11

* Added fully transparent Windows XP icon

* Fixed crash if you try to record (or play) and no audio
devices exist, or if the audio device doesn't support the
mode you selected.

* Audacity no longer sets the process priority to high while
recording on Windows. Users can still do this manually
using the Task Manager.

* Fixed bug that caused last ~100 ms of the selection to get
cut off on Windows.

* Fixed FFT Filter and Equalization effects dialogs.

* Fixed bugs in Unix build system (DESTDIR in locale directory,
choosing libsamplerate instead of libresample)

* Support for LADSPA plug-ins on Windows added, and
three open source LADSPA plug-ins ported to Windows
(GVerb reverb, SC4 compressor, and Hard Limiter)

Changes in 1.2.0-pre2:

* Online help completed. The full manual is nearly complete
and will be posted to the web site for online browsing shortly.

* Audacity will no longer let you do unsafe editing operations
while playing or recording. This eliminates many potential

* Fixed ability to cancel Quit button.

* New resampling library, with no restrictions on the maximum or
minimum rate of resampling.

* Audacity now supports LADSPA plug-ins on all platforms, and
supports VST plug-ins through an optional LADSPA plug-in
called the "VST Enabler", which you can download separately.
Because of licensing issues, Audacity cannot be distributed
with VST support built-in.

* Mac OS X keyboard shortcut problems have been fixed.

* Mac OS X audio muting problems have been fixed.

* Mac OS X playback/recording cursor sync problems have been fixed.

* Silence now displays a straight line again, instead of nothing.

* Added a vertical ruler to the Waveform dB display.

* Fixed crash in Change Pitch.

* You can now Paste if nothing is selected.

* Canceling an Import operation doesn't cause an extra error
dialog to appear.

* Audacity now handles filenames with international characters

* Now outputs ID3v2.3 tags (instead of ID3v2.4), to be
compatible with more MP3 players.

* Minor improvements to build system on Unix systems.

New features in Audacity 1.2:
* User Interface
- Vertical zooming of tracks.
- Improved look and placement of toolbars.
- New custom mouse cursors.
- Complete implementation of editable keyboard shortcuts.
- Find zero-crossings.
- Mouse wheel can be used to zoom in and out.
- Multi-Tool mode.
- Amplify using envelope.
- Labels can store selections (like Audacity 1.0.0).

* Effects
- Repeat Last Effect command
- Improved VST plug-in support
- Most effects now have a Preview button
- Compressor (Dynamic Range Compressor)
- Change Pitch (without changing tempo)
- Change Tempo (without changing pitch)
- Change Speed (changing both pitch and tempo)
- Repeat (useful for creating loops)
- Normalize (adjust volume and DC bias)

* Audio I/O
- 1-second preview command.
- Looped play.

* File I/O
- Audacity 1.2.0 opens project files from all previous versions
of Audacity from 0.98 through 1.1.3.
- Open multiple files from the same dialog.
- Use a text file to specify a list of audio files to open with offsets.

* Updated user manual

* Bug fixes
- Project files with special characters are no longer invalid.
- "Scratchy" noises caused by bad clipping are fixed.
- Audacity no longer exports invalid Ogg files, and does not cut off the
last few seconds of exported Ogg files.
- Mono MP3 files now export at the correct speed.
- Many incorrect results from the Envelope tool have been fixed.
- The "Export Labels" command now overwrites existing files correctly.
- The "Plot Spectrum" window displays the correct octave numbers for
- Several memory leaks are fixed.

New features in Audacity 1.1.3:
* User Interface
- New Mixer toolbar allows you to control the output
volume, input volume, and input source directly
from Audacity.
- Every track now has its own gain and pan controls.

* File I/O
- Uses improved project file format. (Unfortunately reading
previous formats, including 1.1.1, is not supported.)
- Block files (stored in Audacity project directories) now
use the standard AU format. Though some Audacity
meta-information is in these files, they can now be
read by many other popular audio programs as well.
- Fixed some bugs relating to reading/writing audio
files with more than 16 bits per sample.
- Import RAW is functional again, with a simpler GUI
but support for far more file formats. The
autodetection algorithms are much more accurate than
in 1.0.

* Audio I/O
- Completely rewritten audio I/O, with lower latency
and minimal chance of buffer underruns while

* Resampling
- Using high quality resampling algorithms, with the
option of better quality for mixing than for real-time

- Preliminary support for Time Tracks, for changing
playback speed over time.

* Many more bug fixes and new features

New features in Audacity 1.1.2:
* User Interface
- Fixed bug in Windows version, for track menu commands
"Name..." and "Split Stereo Track"/"Make Stereo Track".
* Effects
- Nyquist support on Windows (supports plug-ins written
in Nyquist, an interpreted functional language based
on Lisp).

New features in Audacity 1.1.1:

* User Interface
- Tooltips appear in Status Bar.
- Vertical cursor follows play/record
- Pause button
- Drawing tool (with three different modes)
- Vertical Resizing of stereo tracks is more fun.
- Adjust selection by click-dragging selection boundary
- Toolbar button context-sensitive enabling/disabling
- Better zooming functionality (centers region)
- Multiple ways to display the cursor position and selection
- Snap-to selection mode
- Drag tracks up and down
- Align and group align functions
- Cursor save/restore
- Working history window
* Effects
- Effects broken down into three menus: Generate, Effect, and
- Generate menu lets you generate silence, noise, or a tone
- Nyquist support (supports plug-ins written in Nyquist,
an interpreted functional language based on Lisp)
* Localization
- Improved localization support
- More languages available
- Language selection dialog on startup
* Mac OS X
- Support for more audio hardware
- Support for full-duplex (play while recording)
- Support for MP3 exporting using LameLib Carbon
* Unix
- Audacity now has a man page (it describes command-line
options and how to set the search path)
* File Formats
- Uses libsndfile 1.0, which fixes some bugs and
improves performance
* Searching for Files:
- On Windows and Mac OS, Audacity now looks for
translations in the "Languages" folder and all plug-ins
in the "Plug-ins" folder, relative to the program.
- On Unix, Audacity looks for translations in
<prefix>/share/locale and looks for everything else
in <prefix>/share/audacity and also in any paths in
the AUDACITY_PATH environment variable

New features in Audacity 1.1.0:

* Core audio processing:
- Support for 24-bit and 32-bit sample formats
- Automatic real-time resampling (using linear
* Effects:
- Support LADSPA plug-ins on Linux / Unix
* File formats:
- New XML-based Audacity project format
- Full Ogg Vorbis support now (importing and exporting)
- Export to any command-line programs on Unix
- Support for reading and writing many more types of
uncompressed audio files, including ADPCM WAV files.
* Toolbars
- New toolbar drawing code; automatically adopts your
operating system's colors
- New toolbar buttons (Skip to Start, Skip to End)
- New Edit toolbar
- Toolbar buttons disable when they're not available
* User Interface
- Fully customizable keyboard commands
- Autoscroll while playing or recording
- New Ruler, used in main view and in
FFT Filter effect
- The waveform now displays the average value in a lighter
color inside the peak values
* Localization
- Audacity can now be localized to different foreign

New libraries in Audacity 1.1:

* libmad for fast MP3 importing
* libid3tag for editing MP3 file information
* libsndfile to read and write more audio file formats
* PortAudio for cross-platform audio playing and recording