On Fri, Oct 2, 2009 at 3:16 AM, Clemens Ladisch <[email protected]>wrote:
> Evan DeMond wrote:
> > Just acquired a Edirol UM-2EX, a little USB MIDI adapter with 1 input and
> 2
> > outputs, and I only seem to be able to use one of the outputs. Plugging
> it
> > into my Eee PC (Arch Linux with ALSA 1.0.20) creates /dev/midi1, to which
> I
> > can read and write with no trouble.
> > But the second MIDI out is silent - does anyone know how I could open
> > it, perhaps through the ALSA library, or somehow getting a /dev/midi2,
> > or otherwise?
>
> In the ALSA raw MIDI interface or sequencer interface, both ports show
> up (see the output of "amidi -l" or "aplaymidi -l"). All ALSA
> applications will see the second port.
>
Thanks - will delve into the rawmidi API when I get the chance.
(You could access the second port through /dev/midi1 by opening that
> device a second time while it's still open.)
>
Just tried this, and while it will let me open /dev/midi1 twice, any notes
sent using either of the handles sends the data on the first output
only. Going back to /proc/asound/card1/midi0 shows data transmitted on
Output 0, but still no bytes on Output 1.
(Did this with a simple Lua script that opened "/dev/midi1" twice in "wb"
mode, wrote a Note On message to each, and flushed/closed them.)
Could this just be the behavior of the UM-2EX, or of ALSA's OSS emulation,
or might I be omitting something? Happy to provide any details that would
shed some light.
Thanks,
Evan
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