The Mobile Pre is not supported yet, but the M-Audio keyboards are. Still there are some M-Audio USB devices that violate the USB specification and thus will (likely) never work on Linux kernel 2.6. This is the M-Audio Quattro (tested by myself) and the M-Audio Audiophile (not tested by me). Other M-Audio devices need a firmware loader to get working on Linux. Long story made short: I will never buy a M-Audio USB device again. (Anyone interested in buying my as-new Quattro?)
I don't understand this. I had an M-Audio Quattro once and it was working perfectly with kernel 2.4, Alsa and PD....all 4 channels in and out. This was back when Also worked with PD though.
-august.