[linux-audio-user] Setup Jack with two different cards ?
arnold at roederberg.dyndns.org
Sat May 14 20:03:54 EDT 2005
On Saturday 14 May 2005 15:14, NiXO Beee wrote:
> I'v been googlin' a bit but to no avail.
> In the machine I'm preparing there is an onboard nforce2 audio chipset wich
> I'd like to use to output some secondary signals (the first card is an OK
> emu10k1, with every in and out working properly.)
> Is there a tutorial somewhere that explains how to do that ?
> Do I have to launch another Jack daemon or can the first one handle two
> sound cards ?
The reasons why this can work or can not work where discussed various time on
this and other lists. The main reason is: The two cards are running with
different quartzes and therefor with (slightly) different sampling rates. So
basicly one of the cards is requesting the data earlyer than the other => you
get glitches and the software will produce error. A solution would be to
create an alsa-plugin which adds a jitter-buffer but this introduces
Another approach is described in the el-cheapo-howto
[http://www.djcj.org/LAU/quicktoots/toots/el-cheapo/], another one is in the
While I think the first approach works (haven't tested due to the lack of two
cards of the same type) I can confirm the second one doesn't work with alsa
and jack. But since both my emu10k1 and my onboard-sound have a 5+1 output (3
stereo-outs each) I didn't invest more as I have only one pair of
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