[linux-audio-user] Multiple sound cards

[Arnold Krille]

On Wednesday 08 December 2004 23:15, Christoph Eckert wrote:
> > It is possible via an .asoundrc but you wont get it to work
> > with jack without xruns. xruns are when one soundcard needs
> > its new data (for playback) before the other card. It
> > happens because your soundcards won't run with _exactly_
> > the same frequency altough all clame to to 44.1kHz/48kHz.
> short question: Is this also the case, if I have three cards
> but only one is used by jack?

Short answer: No. ;-)

Long answer: It happens if you use them at the same time with the same process 
(your jackd).
You can even let jackd use one soundcard for studio mastering/recording and 
use a second card to listen to your own music...

> I also get xruns with my USB card. It's the third card,
> because I have an AC 97 and an USB2MIDI device.

I have three cards too. Getting xruns isn't only an effect of using two 
asynchronous soundcards...

> When I try to run jack, it works, but I get some (but not too
> much) xruns. Should I disable the AC 97 card?

Do as you like, I was happy to realize my on-board does 3 stereo line outs 
accessible from jackd.
If you get xruns, try using a smaller windowmanager and stop all programs you 
don't need for your music. If that isn't enough, stop making music as 
well. :-P
Or use bigger buffers for jackd.

Arnold
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