[fluid-dev] Sound fluid/qsynth/rosegarden not giving stable audio output after a while

[Marc Brevoort]

Hello devlist,

For some time I've been trying to set up a combination of 
fluidsynth/qsynth/rosegarden, with success, however after playing sound for 
a bit, short pops start appearing in the sound, which gets worse over time 
until there's an almost constant rattle/hum in the audio playback. 
Completely restarting Jack and qsynth solves the problem.

Something that might be relevant to this problem is that I've borrowed my 
moms casio CTK-611 keyboard (yeah I know YUCK casio), which I've been using 
as master keyboard
for a while. Running amidi --dump I've noticed that this MIDI keyboard never 
sends
note-off messages. Instead, it sends note-on MIDI messages with a velocity 
of 0 to turn
off the note. So, obviously it doesn't work the way MIDI was designed. What 
can I do?

The piece I'm putting together uses some non-looped soundfonts (piano) and 
some looped-soundfonts (strings and horns). I suspect that once a non-looped 
sample reaches its end, it no longer needs processing by fluidsynth and it 
will be removed from the list of samples to play. However a looped sample 
never ends. Could it be that the poor MIDI implementation of the keyboard 
forces fluidsynth to play more and more and more looped silent samples?

I realize that ultimately I should simply replace the keyboard by one that 
has a proper MIDI implementation, but unfortunately at this moment that's 
not an option to me. Could the poor MIDI implementation be the cause of my 
trouble, and if so, is there anything that can be done to turn a 
zero-velocity note-on message into a note-off message?
Where in the code would I start looking to realize this?

Best regards,
Marc Brevoort

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