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Re: [fluid-dev] Pitch problems with certain instruments

From: Josh Green
Subject: Re: [fluid-dev] Pitch problems with certain instruments
Date: Thu, 23 Nov 2006 18:48:13 +0000

Hello Wolfgang,

I'm not sure what it could be at this point.  Do you have an example
SoundFont that you could send me (off the list) or point me to a link
where I can get it?  Also an example preset that exhibits the problem
could be useful.  I suspect there are still several synthesis bugs in
FluidSynth and I've been meaning to put together some test cases to
verify at the data level that it is operating correctly.  I have noticed
that the chorus effect has a tendency to make things sound rather out of
tune.  Try tweaking the chorus settings in the Plugins->FluidSynth
Control panel to see if it fixes the tuning problem.

As for Swami.  Yeah, development is dead on the 0.9.x branch.  I forked
it a long time ago (sheesh, like 4 years maybe) and I still haven't
managed to get the new and improved version out.  Maybe it will happen
someday, but I'm not guessing anymore.  Unfortunately that means that
the 0.9.x branch is still lacking a lot of features and can be unstable

Best regards,

On Wed, 2006-11-22 at 00:26 +0100, Wolfgang Illmeyer wrote:
> Hi.
> 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
> CHOST=i686-pc-linux-gnu
> 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
> Wolfgang
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