14 May
2005
14 May
'05
8:04 p.m.
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
latencies.
Another approach is described in the el-cheapo-howto
[http://www.djcj.org/LAU/quicktoots/toots/el-cheapo/], another one is in the
alsa-docs
[http://www.alsa-project.org/alsa-doc/doc-php/asoundrc.php?company=Generic&a…]ic#virmulti].
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
speakers. ;-)
Arnold
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