Ben Saylor hat gesagt: // Ben Saylor wrote:
> I would like to use a MIDI sequencer to control a MIDI-controlled app
> (pd). I tried physically connecting the MIDI input and output of my
> SB16PCI externally, but pd and ttrk (sequencer) were unable to open
> /dev/midi at the same time (they both seem to use OSS midi).
>
> Is there a way to do this? Maybe some kind of virtual MIDI device that
> could work like a fifo? Or can ALSA raw MIDI devices be opened by
> multiple programs?
Hey, you found ttrk? Nice app. Here's how I control pd from ttrk:
First you have to configure a virtual midi card within your alsa modules
configuration. Add this:
alias sound-service-1-1 snd-seq-oss
alias sound-service-1-8 snd-seq-oss
alias sound-slot-1 snd-card-1
alias snd-card-1 snd-card-virmidi
This configures a virtual midi card as the second card with index 1,
assuming you have one real soundcard, which would be very useful ;)
Now you have to find out the port numbers for your virtual midi card with
aconnect(1):
$ aconnect -li
client 0: 'System' [type=kernel]
0 'Timer '
1 'Announce '
Connecting To: 63:0
client 72: 'Virtual Raw MIDI 1-0' [type=kernel]
0 'VirMIDI 1-0 '
client 73: 'Virtual Raw MIDI 1-1' [type=kernel]
0 'VirMIDI 1-1 '
client 74: 'Virtual Raw MIDI 1-2' [type=kernel]
0 'VirMIDI 1-2 '
client 75: 'Virtual Raw MIDI 1-3' [type=kernel]
0 'VirMIDI 1-3 '
$ aconnect -lo
client 72: 'Virtual Raw MIDI 1-0' [type=kernel]
0 'VirMIDI 1-0 '
client 73: 'Virtual Raw MIDI 1-1' [type=kernel]
0 'VirMIDI 1-1 '
client 74: 'Virtual Raw MIDI 1-2' [type=kernel]
0 'VirMIDI 1-2 '
client 75: 'Virtual Raw MIDI 1-3' [type=kernel]
0 'VirMIDI 1-3 '
To use ttrk with PD they have to communicate via a 'a'connected pair
of ports, so you have to connect two ports with:
$ aconnect 72:0 73:0
This gives the following setup:
$ aconnect -lo
client 72: 'Virtual Raw MIDI 1-0' [type=kernel]
0 'VirMIDI 1-0 '
Connecting To: 73:0
client 73: 'Virtual Raw MIDI 1-1' [type=kernel]
0 'VirMIDI 1-1 '
Connected From: 72:0
client 74: 'Virtual Raw MIDI 1-2' [type=kernel]
0 'VirMIDI 1-2 '
client 75: 'Virtual Raw MIDI 1-3' [type=kernel]
0 'VirMIDI 1-3
and this means, that /dev/snd/midiC1D0 catches midi messages and sends them
to the connected /dev/snd/midiC1D1.
You get these numbers from the "VirMIDI 1-0" and "VirMIDI 1-1" messages)
The only thing left is configuring the apps to use this connection. With ttrk
this is easy: Just tell it the midi device in ~/.ttrkrc like this:
mididev = /dev/snd/midiC1D0
PD only uses /dev/midi?? devices. To have it use for example /dev/midi11 you
have to start pd witch "pd -midiindev 12". This number must be the midi device
number plus one!
Depending on your setup you should experiment a bit. Let ttrk run, start pd
with different midiindev's and open the "Help->Test audio and Midi" patch
to see, if the ttrk messages reach PD.
Here I use /dev/midi11 with PD and /dev/midi11 is a link I made to /dev/snd/midiC1D1:
$ ls -l /dev/midi11
lrwxrwxrwx 1 root root 17 Sep 10 20:11 /dev/midi11 ->
/dev/snd/midiC1D1
That way it works.
--
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