Apologies taking time to package this up. The patches included are tested against 2.4.19 or later. This patch fixes a few bugs and implements full n-channel support of greater-than-stereo USB audio devices, such as the emagic emi 2|6. I also opted to make the minor extention to OSS to define 24 and 32 bit AFMT modes, and the patch includes this. It does not break any existing OSS compatability, and unaware apps can continue to be unaware. The modified audio.c will build without the OSS extentions to soundcard.h. As suggested, I didn't bother with OSS mixer extentions. The device I care about most doesn't expose a per-channel mixer feature regardless. Also, I was wrong: 2.5's audio.c is different, but the differences appear to be for the sake of keeping up with other changes to USB support. I did not attempt to apply the included patch to 2.5's audio.c, but I'd give it even odds with sufficient fuzz. Monty