You complicate things too much.
Like i said from the first message :
I would like to make a sound card project with 2 stereo input and 1 stereo output that will send this output to the computer (and the 2 input stereo from the computer too). All are 44.1khz
I did a search for "usb audio" and I came across these results
So it is clear i don't want use DSP.
I'm looking for an example with an arduino that can:
- Tell the computer that it has 2 input stereos and 1 output stereo.
- The Arduino must be able to handle a total of 3 stereos of 44.1 kHz each.