[LAU] USB audio device and JACK

[drew Roberts]

On Friday 26 June 2009 13:35:03 Julien Claassen wrote:
> 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.
>    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?

Hey Julien,

I have a zoom H4 that I use with jack all the time. It is set to 44.1 from the 
hardware side.

Qjackctl starts it thusly:

/usr/bin/jackd -dalsa -r44100 -p1024 -n3 -D -Chw:1 -Phw:1

(taken from ps ax | grep jack)

I can run it with lower latency when I need to but I don't push it for my 
simple daily recording. I have used ardour with it but these days mostly use 
traverso as my needs are very simple for my daily stuff.

uname -a gives 
Linux zriven 2.6.24-24-rt #1 SMP PREEMPT RT Wed Apr 15 18:09:25 UTC 2009 i686 
GNU/Linux


>    Kindest regards
>          Julien
>

all the best,

drew