Okay the device seems to be empeg_power. I wrote a test program to read 128 bytes from /dev/empeg_power and ran it several times while a song was playing.. So theoretically each time I call it while a song is playing, the hex dump should look different. No joy. Same 128 bytes each time. I tried changing volume, changing tracks, even changing the VolAdj setting, and the hex dump is the same. So something tells me it's not just reading from the active block. I'll play around with it some more.