M-Audio Fast Track Pro in Linux
Guitar Center had these on sale cheap, and I couldn’t resist. It claimed to be “class compliant” on the box for 2 channel input and 4 channel output at 16-bit/48khz, so I figured it was worth a try.
Much to my amazement, it actually works. At least, mostly. I get the following in /sys/class/sound:
adsp audio controlC0 dmmidi dsp midi midiC0D0 mixer pcmC0D0p pcmC0D1c pcmC0D1p
mplayer can play to both stereo output channels on the device, but only at 16-bit/44.1khz, as far as I can tell:
mplayer -ao alsa:device=hw=0.0 mplayer -ao alsa:device=hw=0.1
Both streams work at once (the headphone stream switch button on the front is really nice), and it sounds great!