[Rosegarden-devel] Finally fixed another MIDI problem of mine

[Nathan P S. <ns...@ph...>]

I finally found what amounted to another annoying problem with my MIDI 
setup and Rosegarden. Unfortunately I don't know enough about MIDI to 
know what ultimately lays at fault, so I figured I'd post what I found 
and leave it at that.  The problem manifested itself when I changed the 
active mix on my Alesis keyboard while Rosegarden was running.  The 
keyboard would show that the mix had been modified, even though it 
shouldn't.   By using a modified aseqview program (modified to print out 
a log file of all midi events) I found that my sequencer was sending 
Program Change and/or Controller events to the MIDI bus.  Rosegarden 
would then resend them back to the keyboard, but it swaps out the 
channel number with the currently active channel in the GUI.  Since the 
channel number is different, the keyboard took that as a real change of 
program command.  

I fixed the problem by finding a configuration option on the keyboard 
which makes it not send MIDI events on program changes.  Might it be 
good if Rosegarden could either filter those out or not change the 
channel number for system events like that?  Or is doing what I did the 
correct solution?

Thanks,
  Nathan