[audacity4blind] Re: Chains not accessible in Mac-version of Audacity

  • From: Gale Andrews <gale@xxxxxxxxxxxxxxxx>
  • To: audacity4blind@xxxxxxxxxxxxx
  • Date: Wed, 21 May 2014 23:30:30 +0100

> From Thomas Byskov Dalgaard <tbd@xxxxxxxxxxxxxxxxxx> 
> Tue, 20 May 2014 20:55:22 +0200
> Subject: [audacity4blind] Chains not accessible in Mac-version of Audacity
> Just a quick notice regarding chains in Audacity.
> It is accessible until the user try to add an effect to a new chain. The list 
> of commands is not visible to VoiceOver that reports his as unknown.
> Will you please look at this?
> I had some audio work that I hoped I could create chains for in the future.
> Tested on Mavericks 10.9.3 and Audacity 2.0.5.
> Please let me know if I can do anything to help with the issues.

Thanks for the report. I added some more detail about it here:
http://bugzilla.audacityteam.org/show_bug.cgi?id=33 .

It may be possible to create the Chain as a text file at 
~/Library/Application Support/audacity/Chains .

The syntax is each command name, colon, then if the effect takes
parameters in the Chain, space-separated parameters for that
command. There should be one command name per line.  

For example:

Normalize: ApplyGain=yes RemoveDcOffset=yes Level=-1.000000 StereoIndependent=no
TruncateSilence: Db=-40 dB Minimum=200 Duration=1000 Compress=4.000000
Leveller: dB=-70 dB Passes=2
Normalize: ApplyGain=yes RemoveDcOffset=yes Level=-1.000000 StereoIndependent=no

For the built-in effects you can find the parameter names in the 
file for the effect in src/effects in the code, under 

For Nyquist effects the parameter name is the name after 
";control" in the effect's .NY file.


The audacity4blind web site is at

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