jay gallivan escribió:
Thanks for your reply. I'm a total newbie to all of this.
Hi Jay,
Pulseaudio is a linux sound system (audio server) desktop oriented and
Jack (Jack Audio Connection Kit) is another one, oriented towards music
production (low latency, anything to anywhere connections...). Both use
the alsa drivers (jack can also use the ffado drivers for firewire audio
devices but this is not your case) but apart from that, they are very
different beasts.
Timidity is a default midi server. It can do jack, but it doesn't by
default. In a musical environment timidity is not as used as qsynth for
example, which is jackified by default. But you must load a soundfont
in qsynth.
In order to use Rosegarden (the audio part) you need the jack audio
server and forget about pulseaudio interfaces (once jack takes hold of
your soundcard, pulseaudio is useless, and, hopefully, harmless). You
launch the server by means of a graphical front-end called qjackctl
(Jack Control in the sound and video menu). First, you press setup to
configure the jack audio server. In the interface field you select your
usb audio card (you will see a generic usb-audio or similar, I guess).
Then press start to activate jack.
If jack does not start, this is the first problem you should solve (more
below).
If it starts, then the jack audio clients, like rosegarden, and many
more (most music oriented programs are jack-aware by default) will show
their ports in the connect window, audio tab, when you launch them.
The MIDI tab stands for jack MIDI which is not used by Rosegarden
nowadays. The alsa tab refers to alsa sequencer or alsa MIDI. It has
nothing to do with jack but it is there for convenience because several
synths and sequencers use the alsa sequencer for MIDI and jack for
audio. Some newer ones use jack MIDI and jack audio but not Rosegarden.
This explains that you could capture midi in Rosegarden despite the jack
server was not active.
Also, take into account that Rosegarden does not make sounds by itself
and it has not any default synth that makes it work out of the box.. It
needs either a software synth plugin or an external synth, either
software (say, qsynth, zynaddsubfx...) or hardware. But this is a
second step. The first step is jack setup.
In order to have jack working in realtime mode (recommended) you need,
as a user, some priorities that you can check in a terminal with:
ulimit -r (this is realtime priority for the user)
ulimit -l (this is memlock limit for the user)
You need the first one at ninety-something and the second one, unlimited
or a reasonable amount of your RAM, in kB. In turn, to gain these
privileges, there must be a file called:
/etc/security/limits.d/audio.conf
with the relevant lines. So please, do a:
cat /etc/security/limits.d/audio.conf
and you must have something like:
@audio - rtprio 99
@audio - memlock unlimited
Now you (you the user) have to belong to the audio group. Check in a
terminal with:
groups
If you see audio (between others) you are done. If you don't, you must do:
sudo adduser user audio
where user is your login name. Then reboot and you will have the
system prepared to use jack
(check again with the ulimit commands)
I don't see anything in Patchbay. In PulseAudio Manager I see
X-Station analong stero as a sink and the same as sources for stereo
and stereo monitor.
Just don't use pulseaudio.
When I connect (via Connect) X-Station to Timidity I am able to play
the keyboard and hear the results via my computer's speakers. And I
can record and playback via Rosegarden when I connect X-Station to
Rosegarden.
Don't use timidity unless you do it jack-aware.
I've tried Audacity on my Windows XP box and I've been able to
pickup/record from the X-Station audio ports - though merged into a
single track for some reason.
So it seems that the X-Station is doing what it's supposed to do. But
that (some component of ) Ubuntu Studio is dropping the X-Station
audio. Any thoughts on that?
See above.
Cheers! Pablo
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