[LAU] No sound with jack

Hi,
I've just installed qjackctl and am having trouble with the audio setup
in a few programs (like pd, supercollider). When I run these programs I
get no sound and also no error messages in qjackctl.
Is there a way to test whether jack is working correctly?

Here is my setup:

Ubuntu 13.04
qjackctl 0.3.10
libjack-jackd2-0
libjack-jackd2-dev

Any help would be greatly appreciated.
Thanks,
Peter

-- 
//=============================
-> Peter O'Doherty
-> http://www.peterodoherty.net
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