On Wed, 2 Sep 2015, D. Michael McIntyre wrote:
> I came up with the Focusrite Scarlett 2i2 after spending a few hours
> researching my options. It was reported working as far back as 2012,
> and nothing since then gave me pause. I like their attitude toward
> Linux, which seems to be, in a nutshell, "We don't support Linux, but if
> anybody is writing a driver for Linux, here are some technical details
> for you."
>
> http://us.focusrite.com/usb-audio-interfaces/scarlett-2i2
>
> I haven't done any real work with the interface yet, but my first
> impressions are really positive. I plugged it in, and it worked.
It's absolutely reliable. I use it via jackd all the time, even when
listening to music or watching videos. I configured pulseaudio to use
jacks, so everything works. The 2i2 runs for hours and hours without
making trouble (like my old M-Audio Fast Track Pro which started
cyloning).
But the 2i2 doesn't have a mixer. No problem, I hear you say, we have
jack_mixer. Yes, we have, but how do we tell all the jack-clients to
connect to the mixer's input instead of system:playback?
Don't cry in despair, there is a solution: jack.plumbing
If jack.plumbing is active and its ruleset is carefully crafted, then
the magic can happen and jack.plumbing disconnects jack-clients from
system:playback and connects them to jack_mixer.
Take this ~/.jack_mixer
-- snip --
<?xml version="1.0" ?>
<jack_mixer geometry="200x290">
<input_channel balance="0.000000" balance_midi_cc="12" name="ALSA"
type="stereo" volume="0.000000" volume_midi_cc="11"/>
<input_channel balance="0.000000" balance_midi_cc="14" name="JACK"
type="stereo" volume="0.000000" volume_midi_cc="13"/>
<input_channel balance="0.000000" balance_midi_cc="16" name="PULSE"
type="stereo" volume="0.000000" volume_midi_cc="15"/>
<main_mix_channel balance="0.000000" balance_midi_cc="8"
volume="0.000000" volume_midi_cc="7"/>
</jack_mixer>
-- snap --
And then take this ~/.jack.plumbing
-- snip --
(connect "alsa-jack\..*jackP\..*:out_000" "jack_mixer:ALSA L")
(connect "alsa-jack\..*jackP\..*:out_001" "jack_mixer:ALSA R")
(disconnect "alsa-jack\..*jackP\..*:out_.*" "system:playback_.*")
(connect "Clementine:out_jackaudiosink-.*_1" "jack_mixer:JACK L")
(connect "Clementine:out_jackaudiosink-.*_2" "jack_mixer:JACK R")
(disconnect "Clementine:out_jackaudiosink-.*" "system:playback_.*")
(connect "Qtractor:Master/out_1" "jack_mixer:JACK L")
(connect "Qtractor:Master/out_2" "jack_mixer:JACK R")
(disconnect "Qtractor:Master/out_.*" "system:playback_.*")
(connect "rosegarden:master out L" "jack_mixer:JACK L")
(connect "rosegarden:master out R" "jack_mixer:JACK R")
(disconnect "rosegarden:master out .*" "system:playback_.*")
(connect "MPlayer.*:out_0" "jack_mixer:ALSA L")
(connect "MPlayer.*:out_1" "jack_mixer:ALSA R")
(disconnect "MPlayer.*:out_.*" "system:playback_.*")
(connect "PortAudio:out_.*[02468]" "jack_mixer:JACK L")
(connect "PortAudio:out_.*[13579]" "jack_mixer:JACK R")
(disconnect "PortAudio:out_.*" "system:playback_.*")
(connect "PulseAudio.*:front-left" "jack_mixer:PULSE L")
(connect "PulseAudio.*:front-right" "jack_mixer:PULSE R")
(disconnect "PulseAudio.*:front-.*" "system:playback_.*")
(connect "jack_mixer:MAIN L" "system:playback_1")
(connect "jack_mixer:MAIN R" "system:playback_2")
-- snap --
Start jack_mixer, start jack.plumbing and let the magic work :)
The next time uncle Holger will tell you how you can move and resize
windows automagically (even to workspaces) with gdevilspie and devilspie
:)
Regards
Holger
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