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Re: [fluid-dev] Sound fluid/qsynth/rosegarden not giving stable audio ou

From: Ken Ellinwood
Subject: Re: [fluid-dev] Sound fluid/qsynth/rosegarden not giving stable audio output after a while
Date: Thu, 10 Mar 2005 14:27:09 -0800 (PST)

Relax, a note-on with velocity=0 is equivalent to a note-off command (according
to one version MIDI spec anyway --
http://www.borg.com/~jglatt/tech/midispec/noteon.htm).  This technique is also
widely used in MIDI files to take advantage of running status, which
significantly reduces file size.


--- Marc Brevoort <address@hidden> wrote:
> 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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