Not to derail the thread or anything but I thought I'd put it out there that the kxstudio ppas configure jack to work out of the box.
I thought I heard that falktx (the main kxstudio dev) is now involved with the Ubuntu Studio project so maybe it's all good there too? I have no idea.
I do know that my vanilla 12.04 Ubuntu setup works like a charm using said ppas. Granted, so far I haven't done any serious recording projects in Ubuntu but the tracks I've played with and imported into ardour work as expected.
Perhaps kxstudio might help someone else?
This is kind of OT, but Bob's problems with jack inspired me to share my experience:
I recently bought a Toshiba Sattelite p 850 and installed Ubuntu Studio 12.10. It's slick and mostly just minor tweaks needed to take care of my office needs.
Then onto musical needs; connect Roland Edirol UA-25EX and start Ardour, which exits unable to start jack. Run qjackctl, try different settings. Finally getting it to run and able to start Ardour I completely fail to record anything. More fiddling with settings. Jack hangs on exit. Ardour crashes. There is no sound from gmusicbrowser or internet either. Hair is pulled out. Starting over.
And everything seems to work, I say "testing, testing" to my mike and hit a few keys on my synth, meters showing input - but it turns out what is actually working is the internal mike. No recording through USB...
I search forums and pull out more hair, to no avail. I randomly change settings, and suddenly!
So here's my recipe to have it all work _out of the box_:
1. connect UA-25EX
2. power up Ubuntu Studio
3. Start jack. Settings:
Realtime box: checked
Priority: DEFAULT
Frames/period: 128 (higher number, more latency. With this I have 8ms)
Sample Rate: 48000 (same as USB interface UA-25EX)
Periods/buffer: 3
Dither: None
Audio: Duplex
Interface: hw:1 (this will possibly be different on another machine)
Input device: default
Output device: default
Channels I/O: default
Latency I/O: default
4. Open sound settings. Disable built-in-audio and set jack sink as fallback
5. Run Ardour and record whatever from wherever! All playback going through USB interface.
So in the end it was quite simple and working out of the box, it was just bloody unintuitive to figure out. And mind you, I still get in trouble if I run sound through pulse before starting jack.
But all in all I like my Ubuntu Studio better and better!
Hope this will be helpful for someone.
Alf
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