Check out http://www.edirol.com/ They make USB audio hardware ranging from the UA-1 ($80; 16 bit 44 khz DAC/ADC, but with very clean output, unlike the cheap $35 knockoffs), all the way up to the UA-5 ($300, 24 bit 96khz, SPDIF, mic, etc). They also have some other products with MIDI support if that's your thing.
The UA-1 should work fine in Linux with the 2.4 USB drivers, since it (presumably) complies with the base USB audio device spec. Anything better than 16 bit / 44 khz over USB 1.0 is outside the spec, iirc, so support on other OSs gets shadier.
(Fortunately, USB 2.0 includes a specification for much higher quality audio devices).
Latency over USB can be awesome when using the right software. 5-10mS is easily possible in Linux.
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"why jerk off, when you can napsterbate?"
well, it sounded funny in my head, anyway.
obligatory karma whoring: http://www.mackie.com/TechSupport/Tech_Library/Own ers_Manuals.asp
The 1400i amp manual was actually funny enough to avoid the dumpster!
Check out http://www.edirol.com/ They make USB audio hardware ranging from the UA-1 ($80; 16 bit 44 khz DAC/ADC, but with very clean output, unlike the cheap $35 knockoffs), all the way up to the UA-5 ($300, 24 bit 96khz, SPDIF, mic, etc). They also have some other products with MIDI support if that's your thing.
The UA-1 should work fine in Linux with the 2.4 USB drivers, since it (presumably) complies with the base USB audio device spec. Anything better than 16 bit / 44 khz over USB 1.0 is outside the spec, iirc, so support on other OSs gets shadier.
(Fortunately, USB 2.0 includes a specification for much higher quality audio devices).
Latency over USB can be awesome when using the right software. 5-10mS is easily possible in Linux.