On Nov 28, 2011, at 2:45 PM, Andy Peters wrote:
>
> On Nov 28, 2011, at 12:58 PM, Robert Bielik wrote:
>
>> Robert Bielik skrev 2011-11-24 11:26:
>>> I wonder if there's any application on Mac OS X that can communicate with the low-level device parameters (such as bass/mid/treble/limiter etc. as
>>> defined in http://www.usb.org/developers/devclass_docs/audio10.pdf) in an USB audio device ?
>>
>> Ok, the term seems to be "feature units" (http://developer.apple.com/library/mac/#technotes/tn2274/_index.html)
>>
>> Thing is that I need to disable the compressor feature unit of an USB audio device (as I can do in Windows).
>>
>> Ideas, please ?
>
> These things should be controlled by a higher level, which is Core Audio. Try searching through the CoreAudio docs, or perhaps ask on its mailing list.
Actually, if AUA does not publish the USB Audio device control, CoreAudio can't do anything. As I explained in my previous email, AUA does not expose compressor controls.
It sounds to me that some custom software may be needed that sends device requests. It is possible to do this from user space.
Alison
>
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