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Re: [fluid-dev] Re: [PATCH] Updated requested changes to FluidSynth-ADDE

From: Josh Green
Subject: Re: [fluid-dev] Re: [PATCH] Updated requested changes to FluidSynth-ADDENDUM
Date: Sun, 07 Sep 2008 11:51:58 -0700

Hello Chris,

I'm just now getting around to having some time to put in FluidSynth.
The modifications you made to FluidSynth look really good, but I noticed
one change that you didn't mention in your PDF.

At the top of fluid_voice_write():

    // If we're switching envelope stages from decay to sustain, force the 
value to be the end value of the previous stage
    if (env_data && voice->volenv_section == FLUID_VOICE_ENVDECAY)
        voice->volenv_val = env_data->min * env_data->coeff;

Any info on this would be great.  I'm in the position where its
difficult for me to tell how correct your changes are, since I don't
have an overall view of the code base, although your rational for the
changes make sense.  I'm going to apply the changes and do some tests.
It would be good to verify FluidSynth synthesis to a SB Live! card or
something of the sort.  I've done this once before by routing audio from
FluidSynth to one channel and a SB Live! to the other and listened with

Thanks for the attention you have given FluidSynth.  Its been difficult
for me to be a decent maintainer for FluidSynth and attend to my other
projects (Swami, libinstpatch, etc) also.  I've suspected many synthesis
issues with FluidSynth, but haven't had much time to investigate them.
Much appreciation and praise to you! :)


On Sun, 2008-08-17 at 15:22 -0500, S. Christian Collins wrote:
> Dear FluidSynth developers,
> I have found another bug that I would like to add to my official bug
> report.  Here is the updated report:
> http://www.schristiancollins.com/temp/20080817_changes.pdf
> The bug discovered is listed under item 6: Modulator Transform
> Calculation Errors.
> You can also download a copy of the code with all the changes already
> made from here:
> http://www.schristiancollins.com/temp/fluidsynth-1.0.8-scc4.tar.gz
> The only change mentioned in my report that is not a part of the
> linked source code is Pedro Lopez-Cabanillas' Windows patch.
> -~Chris
> S. Christian Collins wrote: 
> > Dear FluidSynth developers,
> > 
> > I have updated the compilation of changes that I have made to the
> > FluidSynth code.  Please disregard my previous report
> > (20080711_changes.pdf), as it is now outdated.  You can view the
> > changes in PDF format by downloading from this link:
> > 
> > 
> > http://www.schristiancollins.com/temp/20080808_changes.pdf
> > 
> > 
> > I would like to propose that these changes be implemented in the
> > next version of FluidSynth (1.0.9?). I would like to publish
> > SoundFonts designed for FluidSynth, but my SoundFonts will require
> > some of these changes in order to function 100% as designed. I hope
> > you will agree that these changes are for the better of FluidSynth
> > and consider their inclusion in the project.
> > 
> > I cannot take full credit for these changes, however, as I had an
> > audio programmer make the actual changes to the code (I just told
> > him what needed to be changed).  The programmer, however, prefers to
> > remain anonymous.
> > 
> > 
> > 
> > Thank You,
> > S. Christian Collins
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