[LAU] USB audio device and JACK

[Emiliano Grilli]

Julien Claassen <julien at c-lab.de> writes:

> Hello everyone!
>    I had a USB audio device here, a Zoom h4n, portable recorder/audio 
> interface. When I connect it to my box, it shows up and ALSA finds it.
>    First: ALSA can't open the mixer, no elemtns found, alsamixer says.

That's pretty normal with USB devices

>    Second: I can't use JACK with it, although I read on some forum, that a chap 
> managed with Fedora FC6. JACK tells me something about broken pipe. It runs, 
> but there's no sound and I definitely have to "killall -9" it. :-( I tried 
> JACK with different period sizes (-p) and different frames per period (-n), 
> different samplerates, although I can set these on the Zoom, before I connect 
> it. As I said: ALSA can record from it and play sounds using it.
>    Does anyone of you have an idea on the subject?

Have you tried to run JACK in "capture only" ("-C" IIRC) mode?
If I understand correctly, that device acts only as input device...?

>    Kindest regards
>          Julien

HTH
Ciao
-- 
Emiliano Grilli
Linux user #209089 
http://www.emillo.net