On Sun, Jan 07, 2007 at 07:02:35PM +0100, Julien Claassen wrote: > Hi! > If I have a midi-interface, one of those externals, to which you can connect > more than one device (synth, keyboard), how does this look to alsa? Does it > only see one dvice with a lot of channels or does it see more devices? I think > about getting one to use it with midish, which uses rawmidi devices and I > wonder if it will work. hello! if your MIDI interface has multiple MIDI ports but they don't appear in /dev you can use 'modprobe snd-virmidi' to create virtual MIDI devices (they will appear in /dev). Then you can use aconnect(1) to connect virtual devices to real devices. For instance i have an Edirol UM2 USB-MIDI interface (2 input ports and 2 output ports). According to 'aseqdump -l' devices appear to ALSA as ports 16:0 and 16:1. Virtual devices appear as ports 24:0 25:0 26:0 27:0. $ aseqdump -l Port Client name Port name 0:0 System Timer 0:1 System Announce 14:0 Midi Through Midi Through Port-0 16:0 UM-2 UM-2 MIDI 1 16:1 UM-2 UM-2 MIDI 2 20:0 MPU-401 MIDI 1-0 MPU-401 MIDI 1-0 24:0 Virtual Raw MIDI 2-0 VirMIDI 2-0 25:0 Virtual Raw MIDI 2-1 VirMIDI 2-1 26:0 Virtual Raw MIDI 2-2 VirMIDI 2-2 27:0 Virtual Raw MIDI 2-3 VirMIDI 2-3 $ ls -l /dev/snd/midi* crw-rw---- 1 root audio 116, 8 2007-01-08 21:56 /dev/snd/midiC0D0 crw-rw---- 1 root audio 116, 40 2007-01-08 21:56 /dev/snd/midiC1D0 crw-rw---- 1 root audio 116, 72 2007-01-08 22:06 /dev/snd/midiC2D0 crw-rw---- 1 root audio 116, 73 2007-01-08 22:06 /dev/snd/midiC2D1 crw-rw---- 1 root audio 116, 74 2007-01-08 22:06 /dev/snd/midiC2D2 crw-rw---- 1 root audio 116, 75 2007-01-08 22:06 /dev/snd/midiC2D3 Then, I connect (in both "in" and "out" directions) port 16:0 to port 24:0 and 16:1 to 25:0, so that both ports of my UM2 will be usable as /dev/snd/midiC2D0 and /dev/snd/midiC2D1 $ aconnect 16:0 24:0 $ aconnect 24:0 16:0 $ aconnect 16:1 25:0 $ aconnect 25:0 16:1 At this stage, midish is able to use /dev/snd/midiC2D0 and /dev/snd/midiC2D1. For instance the following will configure devices and start sending everything from device 1 (my keyboard) to device 0 (my sound module) $ rmidish send EOF character (control-D) to quit 1> devattach 0 "/dev/snd/midiC2D0" 2> devattach 1 "/dev/snd/midiC2D1" 3> filtnew myfilt 4> filtdevmap myfilt 1 0 5> songidle press control-C to finish cheers, -- Alexandre
