[PlanetCCRMA] Re: El-cheapo: How to test 3 cards simultaneously?

Rui Nuno Capela rncbc@rncbc.org
Wed Nov 24 06:26:01 2004

Timo Sivula wrote:
> Then, maybe this is a more intimate ;) question: I found out I can start
> three separate instances of Jackstart, one for each soundcard. However,
> nly one of these instances appears in qjackctl for me to use as
> alsa_pcm. Any way to make it possible to see the two other cards also?

That's true. As a client, qjackctl can connect to only one jackd server at
once given time. AFAICT, this is a current limitation of the JACK API, for
which qjackctl strictly complies.

I think there's something in the works on the JACK API arena, something
like the new jack_client_open() function call, that might open the way for
client applications select which jackd server to connect. Sincerely, I
don't know if this will ever solve your problem, but it's a step forward.

OTOH, I don't even know if clients connected to one server will ever chain
audio into other running servers, or if the client:port space will be
uniquely shared among the several servers, letting you connect client
ports across servers (that is, soundcards).

Probably, someone better informed would step in?

rncbc aka Rui Nuno Capela