I currently use a Steinberg CI1, but used in the past some other interfaces always with good results (M-Audio Delta 44, ESI UGM96, Tascam US-122, a couple Ediro

I currently use a Steinberg CI1, but used in the past some other interfaces always with good results (M-Audio Delta 44, ESI UGM96, Tascam US-122, a couple Edirols, etc). Linux audio hardware support has become really good lately: I'm also about to purchase a mixing console with integrated multitrack USB audio card and so far all brands and models I considered work with Linux (Soundcraft, Tascam, Zoom, Presonus, etc).