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

[Damon Chaplin]

On Wed, 2007-08-08 at 10:11 +0200, Clemens Ladisch wrote:
> Damon Chaplin wrote:

> > 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?
> 
> No.  These look like the first four bytes of master volume sysex
> messages, but anything after the first four bytes seems to be missing.
> Sysex messages end with a F7 byte, so it's possible that the following
> data gets misinterpreted.
> 
> Please show the output of "amidi --dump" with some key presses after
> you've used the master volume slider.


Here's a few key presses, then some master volume slider movement, then
another few keypresses:

90 2B 4A
80 2B 24
90 30 34
80 30 27
90 34 3A
80 34 3A
F0 01 7F 7D
F0 01 7F 7C
F0 01 7F 7B
F0 01 7F 7A
F0 01 7F 79
F0 01 7F 78
F0 01 7F 77
F0 01 7F 76
90 2D 29
80 2D 1D
90 30 29
80 30 24
90 34 49
80 34 34

Damon

(By the way another UF5 user has noticed the same problem, so it isn't
just my system. And I'm using Fedora 6, which has alsa-lib-1.0.12-2.fc6)