Re: [fluid-dev] Fluidsynth scale tuning

[Josh Green]

Well, as I've mentioned before my knowledge of FluidSynth isn't all that
complete.  From an initial look at things though:

Looks like the cents to hertz calculation is where the action is
(fluid_ct2hz_real).  This can be found in src/fluid_conv.c.  I really
don't like the way that function looks ;)  There could indeed be some
issues with the way this conversion is done.  There is a table of 1200
values which corresponds to the absolute linear amount of each cent
value from 0-1199 (i.e., 2 ^ (i / 1200)).  I'll have a look over it some
more to verify that all is OK.  If you feel inspired to look at it
yourself and see something amiss, you know what to do :)  Cheers.
        Josh


On Thu, 2007-01-18 at 19:54 +0000, Edenyard wrote:
> Thanks for that, Josh!
> 
> > I've also noticed rather unpleasant sounding tones sometimes.  One thing
> > I have found is that this is often caused by the chorus and/or reverb.
> > Try turning both of those off, or changing the parameters thereof.
> 
> I'll give that a try later. It's a great comfort to know that someone 
> else has noticed it!
> 
> Would you be able to comment on the scale tuning, though? Is it supposed 
> to be equal-temperament or something else? Has its accuracy across the 
> scale ever been checked? Are the semitone intervals set by means of a 
> static table or are they calculated somehow using the twelfth root of 
> two or something?
> 
> > Current FluidSynth annoyances for me:
> > - Gain control is rather hard to get right (output is often clipping)
> 
> I've found that it seems to have a very peculiar 'law': setting it to 
> something less than 1 is fine but it suddenly starts to clip when 
> increasing above 1.
> 
> > - Output clips even when sound card output isn't maxed (internal
> > clipping?)
> 
> I've suspected that for a while now.
> 
> Thanks for your thoughts.
> 
> Cheers, Gerald.
>