I've sent messages to the alsa-users, alsa-devel, and audio-users lists
to get to the point that I'm at now, but they've run out of ideas and
suggested I ask this list.
I'm running the latest kernel - 2.6.10, with the cvs version of alsa
containing updated drivers for the Maudio Quattro and Maudio Omnistudio
(as of about a month ago). This included the patch to make
snd-usb-audio report the Omnistudio as two stereo devices.
Second, hardware: I have an Abit KG7 motherboard with a VIA 686B
southbridge (this chipset combination is often reported as having
problems with audio devices). I've also tested this with an old Intel
440BX and had the same problems. Not sure of the specifics of that
motherboard, though.
Here are my problems:
1) The second channel of the USB device is a lot of noise, and I think
it's a waveform. It's not 60 hz, but it sounds pretty close to that.
2) There are some strange initialization problems:
If you playback on channels 1 or 2 before recording then Jack
will not
do recording and playback at the same time, even though aplay and
arecord run just fine at the same time. What happens when you try is
that you get white noise saturating the signals on all lines.
If you record on channels 1 or 2 before playing back, then you
can never playback on 1 and 2 unless you're using jack (i.e. normal alsa
playback doesn't work anymore - all you hear is silence). This is also
fixed by restarting the device.
3) The S/N ratio is 10:1 on a -10dB signal. Isn't that fantastically
bad?
Any feedback at all that you could give me would be greatly appreciated.
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