[alsa-devel] Problem with CME UF5 MIDI keyboard master volume slider

Damon Chaplin damon at karuna.eclipse.co.uk
Tue Aug 7 18:18:07 CEST 2007

On Mon, 2007-08-06 at 12:41 +0200, Clemens Ladisch wrote:
> Damon Chaplin wrote:
> > I have a CME UF5 MIDI keyboard (USB), which mostly works fine with ALSA.
> > 
> > However if I move the Master Volume slider I stop getting MIDI events -
> > I have to disconnect the snd_seq port and reconnect it to get MIDI
> > events working again.
> Is there any error message in the system log when this happens?

No, I don't think so. You mean /var/log/messages?

> > Also, I wanted to try the rawmidi test app, but what would the device ID
> > be?
> Have a look at the output of "amidi -l".

Thanks. I've got rawmidi working, and it doesn't seem to have a problem
with the master volume slider. So I guess it is an alsa-seq issue.

If I move the slider I get this in rawmidi (4 lines for each increment):

read f0
read 01
read 7f
read 7e

read f0
read 01
read 7f
read 7d

Are they valid MIDI messages?


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