[LAU] Diagnosing JACK

[Len Ovens]

On Mon, 12 Oct 2015, Florian Paul Schmidt wrote:

> The combination of jack2 and pulseaudio is friggin awesome. It's the
> best thing since sliced bread.

:)

> I just start both at session start. PA and jack2 and have the
> pa-jack-sink and source installed. Best of both worlds. They don't
> fight each other too much.

Same

> The only grief I would mention is that pulseaudio could use a policy
> for when the jack server is running and has asked PA to give up the
> sound device: In that case it should automatically switch running
> applications and the default to the jack sink/source, otherwise apps
> might block, due to this still annoying and longstanding ALSA
> behaviour of blocking applications when the sound device is busy). But

/etc/pulse/default.pa
There are three lines:
.ifexists module-udev-detect.so
load-module module-udev-detect
.else

If you comment them out, jack will always be default and ALSA devices will 
not be seen by pulse. This should be ok as you run jack from session 
start.

> PAVUControl is an awesome application. I haven't used a DE mixer in
> ages, cause they all suck ;) Controlling per app volume, switching
> output and input devices on the fly, what's there not to love?

kubuntu comes without and it is one of my first additions... even though 
it pulls in gtk libs.

With ubuntustudio it is standard.

Some kind of alsa mixer is also needed for setting preamp levels and 
routing. Some interfaces have their own (mudita24 for ice1712 based cards) 
or qasmixer seems to be ok. (alsamixer is fine too)

--
Len Ovens
www.ovenwerks.net