Hallo,
Can the Hammerfall Multiface / Digiface run multichannel under Linux without JACK?
If so, what's needed: ALSA? OSS?
yes, if you use the alsa hw interface you have to use 26 channels. or 18, but there is one bug if you use -blocksize it scrambles the sound ;-) (on my computer).
Which Linux (debian, ubunto etc.?)
Linux should be reasonably new, best performance with kernel >= 2.6.13
mfg winfried