FluidSynth plays Incorrect Pitch When Alternate Values Used for “Scale Tune”

... and whether/how to merge in their latest release

Hoping this may be of help, here are the changes in that commit:
http://sourceforge.net/p/fluidsynth/code/205

Can someone provide a way to reproduce the problem in MuseScore?

I think the test case is here: https://musescore.org/en/node/86526#comment-382591
file PercuSynth.zip

EDIT: Sorry for the cross-posting.

Hi, the forum reference was to my rant which referred to the "percussion synthesizer" but I soon discovered that although the problem did occur with percussion, it was to do with scale tuning.

I have just found that the same problem had already been reported by Marc Sabbatella (https://musescore.org/en/node/52271)
"Somehow, though, this soundfont does not seem to work on my system. Well, it plays sound, but all notes come out the same pitch. A C scale just sounds like C C C C C C C C but each note getting progressively darker / more muffled in tone"
The cause was found by ChurchOrganist himself who worked around it in the same way as I did.
"OK, found it :) it seems Fluid responds to a Global Scale Tuning value of 0 by playing everything as middle C! Synthfont and Viena OTOH do not."
Thing is, there are not many fonts for melodic instruments that have a sample for each note, so the bug is less likely to occur for melodic instruments.

As I am not the only one to fall foul of this time waster, is possible somehow to warn anybody using their own soundfonts with Musescore not to use ScaleTune (in the manual section on setting up a soundfont, for example ?

I tried to merge (some of) the changes of r205 into MuseScore FluidSynth.
See: https://github.com/musescore/MuseScore/pull/2433

In the given zip sample set, with the code of the PR the Snare60.sf2 and Snare40.sf2 now give the same sound.
However, the Snare0.sf2 gives a sound shifted towards lower frequencies. By playing with Polyphone and rootkey in the Sample section, I found that the sound is good until rootkey=15; for rootkey<=14 the sound is progressively shifted towards lower frequencies.

@ChurchOrganist: can you please try to test the PR? Unfortunately, I know very little of the synthesizer and of soundfont files, so I cannot judge if the PR introduced unwanted side effects.

About the rootkey=15 behavior: may it be linked to the fact that in fluid.h the function ct2hz is limiting between 1500 and 13500?

Here is a release build of MuseScore for Windows with the PR referenced in #11.
https://drive.google.com/open?id=0BxjayMZiuupOZ1hFUUpXMkxtcUE

The sound distortion for rootkey >= 14 is indeed given by the filter at 1500 and the distortion is most probably due to this line: https://github.com/AntonioBL/MuseScore/blob/fluidtuning/fluid/voice.cpp…
since the root_pitch_hz was limited inside ct2hz, but ct2hz_real does not introduce that bounding, if I understood correctly.
What is the expected behavior in this case?

no progress here?

I have created a .mscz + .sf2 test file that can be used to verify whether or not scale tune is working correctly (it isn't, currently). When scale tune is correctly implemented, all three pitches in the test file should play at the same pitch (F#3).

Also, here is the discussion on the FluidSynth bug tracker that led to the fix upstream, in case anybody is confused on what exactly the issue is here:
https://github.com/FluidSynth/fluidsynth/issues/26

For 2.2, see https://github.com/musescore/MuseScore/pull/3485

Fixed in branch 2.2, commit 7ce640069a

fix #87066: Incorrect Pitch When Alternate Values Used for 'Scale Tune'

Fixed in branch 2.2, commit a96c757cc7

Merge pull request #3485 from lasconic/fix-87066-2.2

fix #87066: Incorrect Pitch When Alternate Values Used for 'Scale Tune'

Not needed for master?

Fixed in branch master, commit 3517971a21

fix #87066: Incorrect Pitch When Alternate Values Used for 'Scale Tune'

Automatically closed -- issue fixed for 2 weeks with no activity.

I'm having a related issue to this thread over here: https://musescore.org/en/node/313543

tl;dr I've created a custom soundfont and can't assign it to two different note placements (above and below a line) with out the pitch changing from one two the other, despite Scale Tune = 0.

I've assigned my soundfont to s.chriscollins's test file and the notes don't sound the same like they should, but the test file with the test sf2 works correctly. Hopefully it is a silly error on my part but I'm new to this and can't figure it out.

If anyone on this thread has time to take a look at my help request above for more details, I'd appreciate it so much!

Well, can't really be the same thing, as this here is fixed since long

Yeah, I know it's not actually the same, but it behaves the same...and after many hours of working this and digging through the forums, I hoped that someone who worked on this issue in the past might point me to additional resources or ideas (things that didn't work when the issue was actually in fluidsynth) to make a sample in a soundfont play as it is without any pitch correction regardless of the percussion "key" it is assigned to (scale tuning is set to zero and the sample is still being tuned). Thanks so much!