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[fluid-dev] Pitch problems with certain instruments

From: Wolfgang Illmeyer
Subject: [fluid-dev] Pitch problems with certain instruments
Date: Wed, 22 Nov 2006 00:26:32 +0100
User-agent: KMail/1.9.5

When I was testing fluidsynth with different soundfonts, I noticed a very odd 
behaviour. I'm not very familiar  with soundfont's terminology, I hope you 
can understand my problem nevertheless:

Certain instruments don't work as expected. At the border of a keyrange, 
there's one key (usually the same key on every octave) which generates the 
wrong pitch, usually one octave too high. If you hold such a key for a longer 
time, you can hear multiple notes (usually the key you're holding and then 
the note one octave below, ... until the lowest octave is reached, and then 
the note on the highest octave,...). I also managed to crash swami (which 
uses fluidsynth?) by holding down such a key on my midi keyboard for several 
seconds (could be swami's fault, though, it doesn't seem very stable to me).

I regret that I can't verify the issue with any other synthesizer, because my 
only other wavetable synth (some creative card) vanished quite some time ago, 
and with it a cd with the only soundfont of which I know that it's correct.

I'm using Gentoo with nptl, glibc 2.4, gcc-4.1.1, 
CFLAGS=CXXFLAGS=-march=athlon-xp -O2 -pipe -fomit-frame-pointer
fluidsynth-Version: 1.0.7a from the pro-audio gentoo overlay

Do you think this is a bug in my (downloaded) soundfonts? Can sfpack do that 
to a soundfont? I don't suppose that this is some logic flaw in fluidynth, 
but maybe a problem with one of the above settings?

Thanks an advance for any help


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