Hi, > 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. Phew, thanks a lot for this hint. Lots of output to read, but otherwise it seems to offer all info I'd like to know. Thanks! > 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. I'll not do further research in the ICH, I guess, but I had great success in configuring qamix using an XML file. Looks promising. Cool tool. Somehow I remember the times when I was struggling with a terratec EWS ISA card some years ago on Win 95 :) . Best regards ce