[linux-audio-user] hdsp no input or output

I'm having some trouble getting audio to and from an hdsp cardbus+multiface II setup. I can load the ALSA modules just fine, the firmware gets loaded, Jack starts up just fine, etc. But when I start up hdspmixer and set levels, I don't get anything from the input channels and I don't hear anything on the output channels. I had this working once before (with ardour, hdspmixer, etc.) so I don't know why I can't get it to go now. I seem to recall there was some trick I had to do to enable everything but I can't for the life of me remember what it was. I'm searched through the howtos and list archives but no mention of a problem like this. Can anyone point me in the right direction? Thanks. -Dave