I gave the PulseAudio/JACK integration a quick check in Ubuntu 11.10, basically I started banshee playing through PulseAudio, and wanted it to play to JACK.

I had these obstacles to overcome:

1) There is still a pasuspender wrapper script when starting qjackctl! Instead of starting "qjackctl", you'll have to start "/usr/lib/qjackctl/qjackctl.real" instead. (This is particularly annoying as I remember having removed a similar script earlier, but apparently it has been re-added by Alessio?)

2) When starting JACK server (from qjackctl), sound from PulseAudio stops, but it complains that the sound device is still in use. This seems to be a timing issue. Just stop and start the server a second time and it works.

3) I used pavucontrol to reroute Banshee's audio stream, so that in pulseaudio, Banshee's is routed to the JACK sink.

--
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic

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