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USB UAC2+HID Multichannel input/output interface York

It is possible, as 3xI2S or TDM stream.
So if I program York as 3 channels I2S stream, then standard Windows drivers will detect York as 5.1 sound card?

Another question, if I sometimes want to listen to a 2.1 stereo stream instead of 5.1, do I need to change the settings in Windows from 5.1 to stereo, or reprogram York? Will it be possible to switch from 5.1 to 2.1 under Windows without problems? Or does Windows not support the 2.1 configuration?
 
So if I program York as 3 channels I2S stream, then standard Windows drivers will detect York as 5.1 sound card?
Now it will be seen as just 2/4/8 channel. To tell windows the exact configuration (3.1/5.1/7.1) a modification of USB descriptor is required. I have plan to do so but it is not there yet.

Another question, if I sometimes want to listen to a 2.1 stereo stream instead of 5.1, do I need to change the settings in Windows from 5.1 to stereo, or reprogram York? Will it be possible to switch from 5.1 to 2.1 under Windows without problems? Or does Windows not support the 2.1 configuration?
It depends on the software, sometimes it is possible to override "global" settings in windows inside the app. If you're up to do some experiments, I'll send you Nano board, I think it would fit into your DSP amplifier project. Please send me PM with address.