Re: [fluid-dev] stereo sounds and panning

[Antoine Schmitt]

Thank you, perfect, this seems like a simple and correct solution.  
I'll do this.
Cheers

Le 19 juin 12 à 18:47, S. Christian Collins a écrit :

> Fluidsynth's panning implementation is correct.  In the SoundFont  
> spec,
> instruments are given a set of default modulators that can be  
> overridden
> by the SoundFont designer if he/she so desires.  One of these is the  
> CC
> 10 -> pan amount, which is set to 500 (50%) by default.  Antoine, you
> will need to change this modulator value to 1000 (100%) at the
> instrument level to achieve the effect you desire (both samples panned
> hard to one side).  You can make this change per assigned sample, but
> it's usually most convenient to change the modulator in the  
> instrument's
> global zone.
>
> I hope this helps.
> -~Chris
>
> On 06/19/2012 12:58 AM, David Henningsson wrote:
> > On 06/18/2012 12:19 AM, Antoine Schmitt wrote:
> > > Hi all,
> > > I'm wondering about the usage of fluidsynth to pan stereo sounds.
> > >
> > > The way I integrate sounds samples in fluidXtra (pluging for Adobe
> > > Director) without using sfonts is by creating a ramsfont preset  
> > > which
> > > contains the sample. That was actually the first reason to  
> > > introduce the
> > > ramsfont in fluidsynth.
> > >
> > > I have a problem for panning stero sounds using this method. WHat  
> > > I do
> > > for stereo sounds is creating a ramsfont preset with two samples
> > > attached to the preset, one fully pre-panned to the left and the  
> > > other
> > > one fully pre-panned to the right, using generators :
> > >
> > > fluid_ramsfont_izone_set_gen(ramsf, bank, presetNum, sampleL,  
> > > GEN_PAN,
> > > -500.);
> > > fluid_ramsfont_izone_set_gen(ramsf, bank, presetNum, sampleR,  
> > > GEN_PAN,
> > > 500.);
> > >
> > > This is fine until I try to dynamically pan the preset. If I fully  
> > > pan
> > > it to the left for exemple, it adds -500 to the pre-pan on both  
> > > samples,
> > > and the left sample gets panned to -1000, which gets maxed to  
> > > -500, and
> > > the right sample gets panned to 0. This gives a preset that sounds  
> > > 50%
> > > panned to the left, and not 100% to the left as one would expect.
> > >
> > > I'm not sure, first of the right behavior for panning on stereo  
> > > sounds,
> > > and second on the best way to do it either using fluidsynth API as  
> > > it
> > > is, if possible, and if not how to modify fluidsynth to do the right
> > > thing, using for example, the FLUID_SAMPLETYPE_RIGHT and
> > > FLUID_SAMPLETYPE_LEFT values for the sampletype member of the
> > > _fluid_sample_t struct, which are not used anywhere in fluidsynth
> > > actually.
> > >
> > > Any idea ?
> > > Thanks
> >
> > Hmm, interesting problem.
> >
> > With the disclaimer that I have not gone to the SF2 spec to research
> > this, what is actually the desired behaviour here, is it
> >
> > 1) Have a mix of the left and right samples both sounding in the left
> > channel, or
> >
> > 2) Have only the left sample sounding in the left channel (the right
> > panned sample being silent/unhearable)?
> >
> > // David
> >
> >
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++ as :: Antoine Schmitt