Audacity Sc4

LV2 is an extensible open standard for audio plugins. LV2 has a simple core interface, which is accompanied by extensions that add more advanced functionality. I'm running Audacity 2.0.5 on Windows XP (yeah I know I need to upgrade.) I downloaded the SC4 compressor plugin a while back but I have no idea what some of the parameters are supposed to do. SC4 SC4 is a stereo compressor with a variable envelope follower for RMS / peak behavior. Unlike the built-in Compressor, SC4 does not 'look-ahead' in order to begin reducing volume before a peak occurs. From version 2.3.0 of Audacity onwards we will no longer be shipping SC4 as part of Audacity. Audacity does not have the Autotune plugin of its own. However, you can install some third-party plugins for your Audacity. Installing plugins is easy, the user just needs to copy the plugin files in the Audacity plugins folder. There are many Autotune plugins that Audacity supports and you can use the one you like. Go to articles SC4 Reference. 0 Comments There are no comments to display. Create an account or sign in to comment.

From Audacity Manual

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Audacity includes many built-in effects and also lets you use a wide range of plug-in effects. You can download many free plug-ins for Audacity from and the links thereon.

To apply an effect, select part or all of the tracks you want to modify, and select the effect from the menu. Titles which end in an ellipsis (...) will bring up a dialog asking you for more parameters.

Although by default, the only effects shortcut is CTRL + R to repeat the last used effect, it is possible to set up your own shortcut for any effect in the menu. For instructions on how to do this please see Keyboard Preferences.

Classes of Effect

There are five classes of effects - the built-in Effects, and four classes of plug-in effects which allow you to download and install additional effects. All classes of effect are applied in the same way. The effects classes are:

  • VST Effect Plug-ins (Windows and Mac only)
  • Audio Unit Plug-ins (Mac only)

List of Built-in Effects

Audacity's built-in effects (those that appear in the program irrespective of the contents of your Audacity and other Plug-ins folders) are above the divider in the Effect menu.

Most of the built-in effects have a 'Preview' button. This allows you to listen to how the first three seconds of the selected audio will sound with your effect applied. If it does not sound quite as you want, adjust the controls of the effect and preview again. The preview length can be changed on the Playback tab of Preferences.


This effect increases or decreases the volume of the audio you have selected. When you open the dialog, Audacity automatically calculates the maximum amount you could amplify the selected audio without causing clipping (distortion caused by trying to make the audio too loud).

Auto Duck...

Reduces (ducks) the volume of one or more tracks whenever the volume of a specified 'control' track reaches a particular level. Typically used to make a music track softer whenever speech in a commentary track is heard.


This is a smooth filter which can amplify the lower frequencies while leaving most of the other frequencies alone. It behaves just like the bass control on a stereo. As with Equalization, amplifying particular frequencies can result in clipping, so it is recommended to Effect > Normalize the track(s) first to -3 dB or lower. If necessary you can always Edit > Undo the Bass Boost, Normalize again to a lower level, then re-apply Bass Boost.

Change Pitch...

Change the pitch of a track without changing its tempo.

Change Speed...

Audacity Sc4 Download

Change the speed of a track, also changing its pitch.

Change Tempo...

Change the tempo of a selection without changing its pitch.

Click Removal...

Click Removal is designed to remove individual clicks on audio tracks and is especially suited to declicking recordings made from vinyl records, without damaging the rest of the audio. It will usually work best on very short clicks. For broader individual pops, you could try the Repair effect.


Compresses the dynamic range by two alternative methods. The default 'RMS' method makes the louder parts softer, but leaves the quieter audio alone. The alternative 'peaks' method makes the entire audio louder, but amplifies the louder parts less than the quieter parts. Make-up gain can be applied to either method, making the result as loud as possible without clipping, but not changing the dynamic range further.


Repeats the selected audio again and again, normally softer each time. The delay time between each repeat is fixed, with no pause in between each repeat. For a more configurable echo effect with a variable delay time and pitch-changed echoes, see Delay...


Adjusts the volume levels of particular frequencies.

Fade In

Applies a linear fade-in to the selected audio - the rapidity of the fade-in depends entirely on the length of the selection it is applied to.

Fade Out

Applies a linear fade-out to the selected audio - the rapidity of the fade-out depends entirely on the length of the selection it is applied to.

By repeating a fade in, the audio will remain quiet for longer then rise more rapidly to the original level. Similarly, repeating a fade out will cause the level to initially drop more rapidly then tail off at a lower level. As with other effects, the fade may be repeated as required by pressing CTRL + R.

For a more customizable logarithmic fade in or fade out, use the Envelope Tool on the Tools Toolbar.


This effect flips the audio samples upside-down. This normally does not affect the sound of the audio at all. It is occasionally useful, for example when the left and right channels of a song both contain equal amounts of vocals, but unequal amounts of background instruments. By inverting one of the channels and not the other and then converting from stereo to mono, the vocals will cancel each other out, leaving just the instrumentals. This only works if the exact same vocal signal is present in both of the channels to begin with.


The Leveller effect makes quiet passages louder and loud passages quieter. It does this in a way that is different from the Compressor effect. As a result it does add some distortion to the processed audio. The only way to be sure if the effect does what you want is to try it. For example, applying this effect twice at its Heaviest setting on a normally-recorded voice can produce an 'air traffic controller' effect.

Noise Removal...

This effect is ideal for removing constant background noise such as fans, tape noise, or hums. It will not work very well for removing talking or music in the background. More details here.

Audacity mp3 plugin


Use the Normalize effect to set the maximum amplitude of a track, equalize the amplitudes of the left and right channels of a stereo track and optionally remove any DC Offset from the track.

Nyquist Prompt...

This brings up a dialog where you can enter Nyquist commands. Nyquist is a programming language for producing and processing audio. For more information see Nyquist Plug-ins Reference.


Use Paulstretch only for an extreme time-stretch or 'stasis' effect. This may be useful for synthesizer pad sounds, identifying performance glitches or just creating interesting aural textures. Use Change Tempo or Sliding Time Scale rather than Paulstretch for tasks like slowing down a song to a 'practice' tempo.


The name 'Phaser' comes from 'Phase Shifter', because it works by combining phase-shifted signals with the original signal. The movement of the phase-shifted signals is controlled using a Low Frequency Oscillator (LFO).


Fix one particular short click, pop or other glitch no more than 128 samples long.


Repeats the selection the specified number of times.


This effect reverses the selected audio temporally; after the effect the end of the audio will be heard first and the beginning last. Some people reverse small portions of audio to make inappropriate language unintelligible, while others believe you can hear subliminal messages if you listen to speech backwards. You can also create interesting sound effects by recording natural events and reversing the audio.

Sliding Time Scale / Pitch Shift...

This effect allows you to make a continuous change to the tempo and/or pitch of a selection by choosing initial and/or final change values.

Time Tracks can be used to bend tempo more flexibly (also affecting pitch) using Envelope Tool.

Truncate Silence...

Automatically try to find and eliminate audible silences. Don't use with faded audio.


Rapid tone quality variations, like that guitar sound so popular in the 1970's.

This effect uses a moving bandpass filter to create its sound. A low frequency oscillator (LFO) is used to control the movement of the filter throughout the frequency spectrum.

The WahWah effect automatically adjusts the phase of the left and right channels when given a stereo recording, so that the effect seems to travel across the speakers.

The following four classes of effect always appear underneath the divider in the Effect menu. Released builds of Audacity include sample Nyquist and/or LADSPA effects.

Nyquist Effects

Nyquist plug-ins provide most of the optional effects underneath the divider in the Effect menu. They are also used to provide some of Audacity's built-in audio generators and analysis tools. A wide range of additional Nyquist effect, generation and analysis plug-ins can be obtained from Download Nyquist Plug-ins on our Wiki.

  • To add a Nyquist plug-in, put it in the Audacity 'Plug-ins' folder.
    • On Windows and OS X the 'Plug-ins' folder is in the directory where Audacity resides - usually C:Program Files on Windows or the 'Applications' folder on OS X.
    • On Linux, the 'plug-ins' folder is in usr/share/audacity if you installed an Audacity package supplied by your distribution, or usr/local/share/audacity if you compiled Audacity from source code. Optionally a plug-in folder can be created in the home directory ~/.audacity-files/plug-ins.
  • The next time you launch Audacity, plug-ins you added will appear in the Effect, Generate or Analyze menus as appropriate.

The following sample Nyquist plug-ins are included in released builds of Audacity:

Clip Fix...

This effect attempts to reconstruct clipped regions by interpolating the lost signal.

Cross Fade In

Despite the name this effect does not do an automatic cross fade between two tracks or clips. Instead it applies a curve that is different from the one used by the Fade In effect. The curve used is one that will result in equal volume throughout the fade once the faded in and faded out regions are mixed.

Cross Fade Out

Despite the name this effect does not do an automatic cross fade between two tracks or clips. Instead it applies a curve that is different from the one used by the Fade Out effect. The curve used is one that will result in equal volume throughout the fade once the faded in and faded out regions are mixed.


A configurable delay effect with variable delay time and pitch shifting of the delays.

High Pass Filter...

Passes frequencies above its cutoff frequency and attenuates frequencies below its cutoff frequency; this can be used to reduce low frequency noise.

Low Pass Filter...

Passes frequencies below its cutoff frequency and attenuates frequencies above its cutoff frequency; this can be used to reduce high pitched noise.

Notch Filter...

Greatly attenuate ('notch out') a narrow frequency band. This is a good way to remove mains hum or a whistle confined to a specific frequency with minimal damage to the remainder of the audio.


Modulates the volume of the selection at the depth and rate selected in the dialog. The same as the tremolo effect familiar to guitar and keyboard players.

Vocal Remover (for center-panned vocals)...

Attempts to remove center-panned audio from a stereo track; vocals are often (but not always) recorded in this way. Vocals (or other audio) can only be removed with this plug-in when panned to center, in other words sounding equally loud in both left and right channels. Help text is available from within the effect's dialog box.



Vocoder synthesizes a modulator (usually a voice) in the left channel of a stereo track with a carrier wave in the right channel to produce a modified version of the left channel. Vocoding a normal voice with white noise as provided in the effect will produce a robot-like voice for special effects. Other carriers can be used for subtly different voices. Vocoder can only be applied to unsplit stereo tracks.

LADSPA Effects

LADSPA (Linux Audio Developer's Simple Plugin API) plug-ins were originally developed for the Linux platform, but ports of some plug-ins are available for Windows and OS X as well. Most LADSPA plug-ins are effects, but they are also used to provide some of Audacity's built-in audio generators and can be used for audio analysis. Additional LADSPA plug-ins can be downloaded for Windows, OS X and Linux.

  • To add a LADSPA plug-in, put it in the Audacity 'Plug-ins' folder.
    • On Windows and OS X the 'Plug-ins' folder is in the directory where Audacity resides - usually C:Program Files on Windows or the 'Applications' folder on OS X.
    • On Linux, the 'plug-ins' folder is in usr/share/audacity if you installed an Audacity package supplied by your distribution, or usr/local/share/audacity if you compiled Audacity from source code.
  • The next time you launch Audacity, plug-ins you added will appear in the Effect, Generate or Analyze menus as appropriate.

Three sample LADSPA effects are included with Windows and Mac builds of Audacity:

Hard Limiter...

An extreme Compressor effect. It can sometimes be used to remove stubborn clicks.

'dB limit' is the input signal level above which the input signal will be clipped.

'Wet level' controls the amount of the clipped signal fed to the output. It thus acts as a volume control applied after the limiter (just as if you applied the effect and then used the Amplify effect).

'Residue level' controls the amount of the clipped signal that will be mixed back in. By default the value is set to zero and so the clipped signal is discarded. By raising this level, some of the clipped signal will be restored, making the limit softer and retaining more of the peaks and troughs of the original waveform. Alternatively if you turn the residue full up and the Wet signal full down, you get only the pieces of waveform that are above the dB limit you chose.


A reverb plug-in. Tips and example settings are available on our Wiki.


A stereo compressor with a variable envelope follower for RMS / peak behaviour.

Audacity will also load LADSPA plug-ins from the following system locations:
  • All operating systems: The path specified by the LADSPA_PATH environment variable
  • additionally on OS X:
    • ~/Library/Audio/Plug-Ins/LADSPA
    • /Library/Audio/Plug-Ins/LADSPA
  • additionally on Linux/Unix:
    • $INSTALL_PREFIX/ladspa
    • /usr/local/lib/ladspa
    • $LIBDIR/ladspa
Effects in the following VST and Audio Units (Mac only) classes are always third-party plug-ins added by the user (and also by the operating system in case of Audio Units)

VST Effects

To add a VST effect on Windows or Mac, put its binary file (for example, the .dll file on Windows) in the Audacity 'Plug-ins' folder. The 'Plug-ins' folder should be in the same directory where Audacity resides.

  1. Launch Audacity and go to the Effects tab of Preferences
  2. Check Rescan VST effects next time Audacity is started and click OK
  3. Quit and re-launch Audacity - the plug-ins you added will appear in the Effect menu

Note that the Rescan VST effects next time Audacity is started preference will now be un-checked.Audacity caches information about available VST effects rather than slow down each launch by scanning for VST effects. Therefore each time you add a new VST plug-in, it will be necessary to enable a launch-time rescan in Preferences.

When scanning, Audacity also looks for VST plug-ins in the following system locations:

  • Windows and OS X: The path specified by the VST_PATH environment variable
  • additionally on Windows:
    • Windows Registry key HKCUSoftwareVSTVSTPluginsPath
    • Windows Registry key HKLMSoftwareVSTVSTPluginsPath
  • additionally on OS X:
    • ~/Library/Audio/Plug-Ins/VST
    • /Library/Audio/Plug-Ins/VST

Audio Unit Effects

Audio Units (AU) are a system-level plug-in architecture provided on Mac OS X computers. To add an Audio Unit effect, place it in either of the following system plug-in directories:

  • ~/Library/Audio/Plug-Ins/Components (user plug-ins)
  • /Library/Audio/Plug-Ins/Components (system-wide plug-ins)

The next time you launch Audacity, newly added plug-ins will appear underneath the divider in the Effect menu.

This is a website for GPL'd (free software) audio plugins. At the moment the only ones here are for LADSPA, the Linux Audio Developers Plugin API.

You can find information about downloading on the download page.

If you're looking for Windows versions...

Vaughan Johnson (from the audacity project) kindy added some windows compatibility code, to make it possible to build 3 of my plugins. However I have not run Windows for years, and I have no idea how to build plugins for it, so please dont mail me about it.


New release on github, 0.4.17. Bugfixes only.


New release on github, 0.4.16.

2014-07-07 (backdated)

The LADSPA plugins are on GitHub check there for updates and new releases.


My LV2 plugins are now hosted at github. Please contact me if you want write permission.


Patch by Tres Finocchiaro, which allows the LADSPA plugins to build on LLVM.


Not audio related, but I hacked out a quick Condorcet Method vote solver over the weekend. It takes vote data in RDF and works out who beat who, and outputs it in RDF/Turtle.


First public release of version 1.0.15 of my plugins ported to LV2. Builds OK on x86 Linux, but doesn't build on OSX Leopard (10.5) and doesn't install correctly on any version of OSX.


I've written a simple app that works around a bug in Apple's iCal which causes you to get a message saying that youve been invited to a meeting that doesn't include your email address, when it does. You can get the app here.

Nothing to do with audio plugins, but I had to link it from somewhere...


Sorry the site has been down for a while, I left my university job, and they were hosting the server with on it (among other things), and when it went down, I didn't have anyway of getting it back up.

Appologies to anyone who was trying to mail bug reports to either email address, they've probably gone to /dev/null. steve at should now be working again.


Free Audacity Plugin

A build of 0.4.15 is now available for OSX, Intel and PPC. Thanks to Jesse Chappell and Taybin Rutkin for making that package.


New plugins release 0.4.15.

Fast Lookahead Limiter
fix an audible buf that caused the limiter to 'pump' when it shouldn't. This plugin is used by Jamin, so all Jamin users should upgrade. Many thanks are due to Sampo Savolainen for identifying the problem and working out the fix.
All IIR filters
denomral fixes from Tim Blechmann.
SVF filter
possible denormal improvements.
Crossover distortion
added patch from Tim Blechmann that fixes a NaN-related bug.
Build system
patch from Anand Kumria to fix build options on x86_64 and popwerpc64


New plugins release 0.4.14. Changes are mostly compatability with gcc 4 and some minor bugfixes. No strong reason to upgrade if things are working fine for you.


New SWH Plugins release 0.4.13. Changes include removal of denormals from the SC4 and SC4 mono plugins, and the fast lookahead limiter. These changes are especially important for people running JAMin on Pentium 4's. There is also some mild quality imrpovements to the tape delay and FAD delay, but more needs to be done there.


New liblo release 0.16, this release has some bugfixes for systems with misconfigured networking, better handling of IPV6 OSC URLs, and a way to detect what the source port of an incoming message.


Plugins release 0.4.12. Bugfix to the compressors, fixes a problem that made SC4 appear to suffer from denormals and made SC1 unstable. Also added mono version of SC4 by Joel White.


Plugins release 0.4.11. This release fixes bugs in the reverse delay, flanger and multiband EQ. Two new plugins, and artifical latency plugin (mainly for testing) and a crossfader, thats not really tested. There is a new build system that should make it easier to port to other platforms, but may cause problems.


Plugins release 0.4.7. Fixes to the build system, should now build OK!

New plugin: Fast Lookahead Limiter, a 5ms attack, variable release time lookahead limiter, supceeds the previous ones - do not use them they had critical bugs.

Fixes to the 'Pro-Logic' surround encoder from Prakash K. Cheemplavam


Plugins release 0.4.4. Fixes to build on recent gcc, new limiter for beter performance in JAMin, denomal fixes from Tim Blechmann. This release is largely untested, I released it because there are a number of important outstanding fixes.


Release 0.4.3. 8 new plugins and quite a few fixes.


Release 0.4.2. Stabalised experimental features, added several bugfixes and new filters from Alexander Ehlert. This one should now be more stable than the 0.3 series.

Release 0.4.0. Lots of experimental features. A lot of work has been done to the SCn compressors, so they may well work better now. If you are after stability then try the last 0.3 release.


Release 0.3.7. Lots of bugfixes, highly recommended upgrade.


New mini-app, JACK TimeMachine. You wire it into a JACK graph and it buffers up the last 10 seconds of audio, and starts writing it out when you hit record. It then catches up to realtime. The files it writes are timestamped, stereo 32 bit float WAV files. The parameters can be changed with a recompile.


Version 0.3.6 - Bugfixes. REALLY fixed UID problem. Sorry!


Version 0.3.5 - Bugfixes. Serious problems with UID clash, two other, milder problems fixed.


Version 0.3.4 - Bugfixes to GSM sim, FM, osc and audio divider, new compressor, limiter, delay and two flangers. Should now build on FreeBSD, RDF syntex error fix. See ChangeLog for details.


Version 0.3.3 - improved the sound quality and channel seperation on the old Bode shifter, added a new one with more control and added an AM pitch shifter.


Oh dear, I forgot to check in from all my cvs directories, so the UID fix never appeared! Sorry, here is a fixed version. To make up for it I have included a 'Bode/Moog Frequency Shifter', a funky effect useful in synthesis.


New release, v0.3.1. Fixed bug in the analogue oscilator that was causing distortion, fixed bug were two different plugins had the same UID (erk!), added up-to-date RDF metadata. Now builds OK on PPC Linux. One new plugin, chebstortion a highly synthetic, but still interesting reactive distortion.

Audacity Sc4


Long overdue plugins release, v0.3.0. New plugins: compressors (SC1-3), z-1 and a signal inverter. The last two probably aren't much use to most people, but come in handy. Also, the valve plugin has been optimised, as have a number of others. There are also sound quality improvements to the gong and plate reverb.


New version of Meterbridge. Some general improvements and a scope meter.


New release, v0.2.8, lots of new plugins, updated the FAQ with uptodate and completeish CPU use information. Worth downloading.

If you want to contact me about these plugins, you can ask questions via GitHub. Bug and sound quality reports welcome.

Audacity Sc4 Settings

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