Hallo!
Can the Hammerfall Multiface / Digiface run multichannel under Linux
without JACK?
yes!
If so, what's needed: ALSA? OSS?
I always use ALSA and have to patch the source - but I think in the latest PD 0.39 Winni's patch is included ... OSS also works I think.
Which Linux (debian, ubunto etc.?)
I use debian, but it should also work on the other distributions.
LG Georg