Ok, already tried it a few hours. It allowed me to push my onboard hda_intel card with an
IDT codec down to -p32 -n3 -r48000 with a youtube+alsa_in and amsynth test.
With everything open and producing output, the max dsp load was 14% on my T6400 (core2
2GHz).
Suspend, resume and hibernate worked fine and the module can be unloaded without freezing
the laptop.
With my Fast Track Pro worked fine too in its ¿hardware? lowest limit of -p64 -n2 -r48000
but I can't test suspend and resume since snd_usb_audio freezes the computer if the
card is on when the computer goes to sleep (probably solveable through unloading the
module before sleep with pm-utils).
MIDI tests coming.
What a great discovery.
Thanks to Joakim and everyone in this thread.