Looks like this issue actually consists of 2 parts:

1) jackd takes total control over a device. This is desirable for
performance reasons, but leaves non-jack-aware apps (like pulseaudio
applications) out in the cold. The ideal solution would be to include
module-jack-sink in pulseaudio and switch pulseaudio to that whenever
jackd is running for a given sound card.

2) a workaround until (1) is implemented, is to use 2 sound cards, one
for pro audio and one for other sounds. Problem with this workaround is
that starting qjackctl suspends pulseaudio when it starts anyway. What
we'd really need here is a way for qjackctl to say 'please clear hw:0, I
want to claim it exclusively' when qjackctl (or jackd) is started: this
would have to suspend pulseaudio *only* if it's bound to the specified
device, and leave it running otherwise.

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Pulseaudio not working while jackd is running
https://bugs.launchpad.net/bugs/480103
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