Adjustable Fade "Error" error.


Running Audacity 2.2.1 (program build Dec 6 2017) on Windows 10 64-bit version 1607.

I am trying to use the Adjustable Fade effect on a sound clip I have, and clicking either the Preview or OK button will result in an “Error” message box. Have completely uninstalled Audacity and reinstalled with no avail as well as deleting the AppData folders and such created by audacity. Any recommendations?

Does the problem happen with just that one project, or all projects?
How big is the project and how long is the selected audio?
Do the “High Pass Filter” and “Low Pass Filter” effects work?

This problem happens with all projects and different music files, this particular one being 1:30 in length approximately 6.6kb in size. The selected audio is about 3 seconds long.

High pass and low pass filters also do not work upon troubleshooting. I receive errors of “Nyquist returned the value: x” depending on the rolloff chosen.

Take a look in “Help > Diagnostics > Show Log”.

There is usually a load of stuff related to loading FFmpeg at the start, so to make things clearer I’d suggest that you:

  1. Launch Audacity
  2. Open the Log
  3. Clear the log
  4. Attempt to run any Nyquist effect (such as Adjustable Fade or High-Pass Filter).

I would expect there to be some error / debug information in the log. If there is, please post it with your reply.

HI Steve

Here are the results of clearing the log and reattempting the Adjustable Fade:

14:37:32: Audacity 2.2.1
Log Cleared.
14:38:01: ‘Adjustable Fade’ returned:
error: unbound function - MULT

What is the system language of your computer?
What is the exact location of the “audacity.exe” file?

Please also restart Audacity, and then open the Log, and post the contents.

The problem is that Nyquist is unable to find some of its files. My suspicion is that it is because the path includes Unicode characters, but Nyquist only understands ASCII.

Hi Steve

My system language is English and the location of Audacity.exe is C:\Program Files (x86)\Audacity

Here is the contents of the log after restart:

17:11:20: Audacity 2.2.1
17:11:20: Trying to load FFmpeg libraries...
17:11:20: mLibAVFormatPath ('C:\Program Files (x86)\Audacity\ffmpeg-win-2.2.2\avformat-55.dll') is not empty. Loading from it.
17:11:20: Looking up PATH environment variable...
17:11:20: PATH = 'C:\ProgramData\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files\OpenVPN\bin;C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit\;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files (x86)\Microsoft SDKs\TypeScript\1.0\;C:\Program Files\Microsoft SQL Server\120\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server\120\Tools\Binn\ManagementStudio\;C:\Program Files (x86)\Microsoft SQL Server\120\Tools\Binn\;C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\PrivateAssemblies\;C:\Program Files (x86)\Microsoft SQL Server\120\DTS\Binn\;C:\Program Files (x86)\Microsoft Dynamics AX\60\Client\Bin\;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\110\Tools\Binn\;C:\Program Files\Microsoft SQL Server\120\DTS\Binn\;C:\Program Files\Microsoft Dynamics AX\60\BusinessConnector\Bin\;C:\Program Files (x86)\Microsoft Team Foundation Server 2012 Power Tools\Best Practices Analyzer\;C:\Users\andy\AppData\Local\Microsoft\WindowsApps;C:\Program Files\Microsoft Dynamics AX\60\ManagementUtilities'
17:11:20: Checking that 'C:\Program Files (x86)\Audacity\ffmpeg-win-2.2.2' is in PATH...
17:11:20: Warning: FFmpeg directory 'C:\Program Files (x86)\Audacity\ffmpeg-win-2.2.2' is not in PATH.
17:11:20: Temporarily prepending ';C:\Program Files (x86)\Audacity\ffmpeg-win-2.2.2' to PATH...
17:11:20: Checking for monolithic avformat from 'C:\Program Files (x86)\Audacity\ffmpeg-win-2.2.2\avformat-55.dll'.
17:11:20: Error: Couldn't find symbol 'avutil_version' in a dynamic library (error 127: the specified procedure could not be found.)
17:11:20: Error: Couldn't find symbol 'avcodec_version' in a dynamic library (error 127: the specified procedure could not be found.)
17:11:20: avformat not monolithic
17:11:20: Loading avutil from 'avutil-52.dll'.
17:11:20: Loading avcodec from 'avcodec-55.dll'.
17:11:20: Loading avformat from 'C:\Program Files (x86)\Audacity\ffmpeg-win-2.2.2\avformat-55.dll'.
17:11:20: Returning PATH to previous setting...
17:11:20: Actual avutil path C:\Program Files (x86)\Audacity\ffmpeg-win-2.2.2\avutil-52.dll
17:11:20: Actual avcodec path C:\Program Files (x86)\Audacity\ffmpeg-win-2.2.2\avcodec-55.dll
17:11:20: Actual avformat path C:\Program Files (x86)\Audacity\ffmpeg-win-2.2.2\avformat-55.dll
17:11:20: Importing symbols...
17:11:20: All symbols loaded successfully. Initializing the library.
17:11:20: Retrieving FFmpeg library version numbers:
17:11:20:    AVCodec version 0x373466 - 55.52.102 (built against 0x373466 - 55.52.102)
17:11:20:    AVFormat version 0x372164 - 55.33.100 (built against 0x372164 - 55.33.100)
17:11:20:    AVUtil version 0x344264 - 52.66.100 (built against 0x344264 - 52.66.100)
17:11:20: FFmpeg libraries loaded successfully.

This is puzzling. I’ve seen this problem once before, but that was with Audacity running from a folder having Cyrillic characters in its name.
For some reason, some required Nyquist files are not being found, but I don’t yet see any reason for that.

In the Effects menu, do you have the “Nyquist Prompt” effect listed?

Hi Steve

Yep I have Nyquist Prompt in my menu.

Look in C:\Program Files (x86)\Audacity
There should be a folder called “Nyquist”. Is it there?
In that “Nyquist” folder should be 28 “.lsp” files and a folder called “rawwaves”. Are they there?

HI Steve

Yep I have a folder of C:\Program Files (x86)\Audacity\Nyquist that contains the files and folder you mentioned.

Thanks Steve

Where exactly did you obtain Audacity from?

Hi Steve

I downloaded it from

Audacity 2.2.1 installer

OK, let’s try this:

  1. Ensure that Audacity is not running.
  2. Download Audacity 2.2.1 zip file (11.57 MB) from here:
  3. Test the SHA-256 to ensure that it has downloaded correctly (see:
  4. Extract the ZIP file somewhere convenient, for example, on your Desktop. Ensure that it is a location that you have full read/write access.
  5. Open the extracted folder and find the file “audacity.exe”
  6. In the same folder as the “audacity.exe” file, create a new folder and name it “Portable Settings” (without the quotes)
  7. Double click on the audacity.exe file to launch Audacity
  8. Close the Welcome screen
  9. From the Generate menu, generate 30 seconds of Noise
  10. Ensure that the track is selected, then from the Effect menu, open “High Pass Filter” and apply it.

Does that work?