Christoph Eckert wrote: > > Each card is different. > > I'd like to mix my Terratec Aureon USB. USB devices have descriptors that describe all mixer controls and their routing. You can find this information in the output of "lsusb -v" if you know what to look for. > BTW: I also googled to find a nice image showing the signal > flow of AC97 cards, but I haven't been successful. What all AC'97 codecs have in common is that they don't completely conform to the standard. The datasheets (if they exist) usually contain such a diagram. HTH Clemens