I can see a few software hacks to get the volume control working on the line level outputs but for a Linux novice like me who is handy with a (fine tip) soldering iron, it will be quicker for me to patch the output of the volume chip (LM1972M) to the RCA outputs. I found the inputs to the power amp and it looks straight forward but has any one done it ? Are there really no schematic digrams around for these units ?