2011/12/11 Clemens Ladisch
<clemens@ladisch.de>
thijs van severen wrote:
> amidi -l should list all midi out ports that are available to amidi, right?
It lists all ports implemented by an ALSA kernel driver. It is possible
to implement raw MIDI ports in software, but those are not listed.
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ALSA's raw MIDI interface and sequencer interface are different.
Usually, you want to use the latter. Try "aplaymidi -l".
> Another question: will a usb midi interface list the midi ports under alsa?
Yes.
OK that seems to work fine, and the USB midi interface shows up when i run amidi -l :-)
i created a virtual midi device that dumps incoming data in a terminal window (using amidi -p virtual d), and connected the midi input port of the USB interface to that virtual interface (in qjackctl)
then i connected my FX unit to the usb interface and configured the FX unit so it sends midi messages
whenever i turn the 'preset select' knob on the FX unit the midi data shows up in the terminal window
if i then send this midi data back tot the FX unit (using amidi -p hw:2,0,0 -S 'C1 09') the unit jumps to the correct preset :-)
however, this does not work when jack is running. if jack is running i get this message :
ALSA lib rawmidi_hw.c:233:(snd_rawmidi_hw_open) open /dev/snd/midiC2D0 failed: Device or resource busy
cannot open port "hw:2,0,0": Device or resource busy
looks like jack claims the device.
this is blocking for me since i need to have jack running for my audio routing :-(
any ideas ?
grtz
Thijs
Regards,
Clemens