AU plugins - problems when muting/unmuting tracks

Installation & Configuration Mac OS X
#1

using the latest build of Ardour2 on OSX 10.68 I am experiencing stuck buffers with my IPlug made audio-units when unmuting tracks containing those plugins.

IPlug is an open source framework (which I am developing/maintaining) for targeting multiple plug-in formats, you can see the project and the issue reported here:

It seems that when un-muting a track with a stereo IPlug audiounit on Ardour2/mixbuss does not reconnect the input buffer for the right hand channel. This issue has not appeared on any other OSX AU host, and I have tested a lot, so I think it might be an issue to do with Ardour’s AU implementation (although other non-IPlug AUs I tried were OK!)

The source code for IPlug’s AU implementation is here:

https://github.com/olilarkin/wdl-ol/blob/next/WDL/IPlug/IPlugAU.cpp

here is an example “AGain”-style audiounit plugin to demonstrate this bug:

http://dl.dropbox.com/u/33721778/IPlugEffect.component.debug.zip

and here is a “Tracer build” which should print lots of debug info about which methods are called to the stdoutput (check console.app)

http://dl.dropbox.com/u/33721778/IPlugEffect.component.tracer.zip

Does anyone have any idea why this might be happening?

thanks very much,

oli

#2

thanks,

GMT - olil on IRC

#3

@olilarkin: track muting has absolutely no effect on plugins whatsoever in Ardour. Muting a track doesn’t stop the plugin from being executed, or change its “wiring” in any way. I’ll try to take a look at the issue when I can. It will be more productive by far to discuss this on IRC. What timezeon are you in?