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[fluid-dev] using fluidsynth to create soundfont based samples for a sup

From: Michael Geis
Subject: [fluid-dev] using fluidsynth to create soundfont based samples for a supercollider sampler
Date: Wed, 24 Aug 2011 14:06:49 -0700 (PDT)

am trying to use soundfonts for a supercollider sampler that friends are working on.

It would be enormously helpful if you could give feedback on my train of thought below
regarding whether and how this could be achieved with fluidsynth. As I am new to
soundfonts, my approach may be rather naive.

The current idea is to create each sample file by passing fluidsynth a one note .mid file,
outputting the raw wave data to file and then converting to .wav with sox.

The sampler is not very complicated, it essentially applies an ADSR envelope
to the samples. So as long as I can pry those four phases apart within
every .wav file I get from fluidsynth (i.e. find the offset in frames into the .wav
for beginning and end of each phase), it is likely going get the job done or at least be
reasonably close to what they need.

I looked at the pysf (http://code.google.com/p/pysf/) utility and its output lists either
start times or durations for every envelope, which leads me to conclude (hope?) that the .sf2
format actually specifies envelope length and that these would be the parameters I need
(because my friends want to vary them).

So, is there a way of figuring out what frames within a one note .wav sample that is produced
by fluidsynth demarcate the starting and end points of the phases of an ADSR envelope?
How would one go about it?

Thanks for your consideration.


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