Hello, I have been using my hammerfall light (digi9636) under linux for quite some time to record s/pdif. I recently got an expansion board (AEB8-O) to use the hammerfall for output as well. I cannot get it to output music in alsa, and I'm not sure why. The really confusing part is that I can get a faint and very distorted sound out of the board if I intentionally reverse the wire (ground/signal polarity) between the hammerfall and the expansion board. I don't see any settings that are relevant to this sort of output in alsamixer, Anyone have any ideas? Here is what I did. I connected the boards and powered up my machine. Both green and red lights were lit. I then started up JACK + Ardour and connected the outputs of my ardour master out to all of the sound outputs of the digi9636 and then started the music. I couldn't hear anything through my headphones connected to the AEB8-O no matter which port I used. I thought that I had perhaps reversed the polarity of the cable connecting the digi9636 to the AEB-O, so I turned off my machine and reversed the connector on the digi9636. When I powered up neither of the lights were lit. However, when I tried to play music, after about 15 seconds of play I could hear a very faint, very distorted version of the song I was trying to play. I turned off my machine and changed the jumpers on the AEB-O to the other decibel level (even though they seemed to be on the louder setting by default) and tried again with both polarity settings. I still had the green and red lights lit when the cable was set to the correct polarity and still no sound. When I reversed the polarity again, there was the same very faint distorted music after several seconds of silence, and still no lights. Can anyone help me? Thanks, -- Alex