Re: [fluid-dev] The missing filter

[jean-jacques.ceresa]

Hi, Peter

Theses aren't handled by FluidSynth (1.1.6):
- cc71(timber/harmonic intensity) nor
- cc74 (brightness).

Also monophonic instrument aren't handled yet:
- Basics channels
- cc Poly/mono, cc omni on/off
- cc legato on/off
- cc portamento on/off
- cc portamento time
- cc portamento control
I am currently working on this monophonic support, writing a proposal 
before coding.
It isn't an easy task !

For each voive, there is a filter controled by modulation enveloppe and 
Modulation LFO
GEN_FILTERFC:  Is the cutoff frequency of this filter
GEN_FILTERQ:  Is the resonance coefficient
This real time filter has nothing to do with cc71 and cc74 which are mainly 
"statics".

regards

Le 10/03/2016 09:05, Peter Billam a écrit :
> Greetings.
>
> On reading
>   https://schristiancollins.wordpress.com/2016/03/02/using-soundfonts-in-2016
> I noticed that fluidsynth gets full marks for its cc71,cc74 filter
> implementation.  That's good news, but it was a big surprise for me,
> because I've never experienced the fluidsynth filter to have any
> effect at all. The only controllers which seem to be implemented
> are the low-cpu amplitude-related things like volume and pan,
> plus also the (configurable) chorus and reverb.
>
> And yet Christian Collins reports quite the opposite, and indeed
> looking in the source I do see in src/synth/fluid_voice.c
>    case GEN_FILTERFC:
>    ...
>    case GEN_FILTERQ:
>    ...
> which don't seem qualified by any ifdefs and certainly make it
> look like the filter should be implemented.  I don't see any option
> to turn the filter on or off ...  I've previously discussed
> fluidsynth on comp.music.midi (while that still had any traffic)
> and others confirmed my experience that filter does not function,
> let alone other controllers like portamento...
>
> fluidsynth is still my favourite synth for real-time use because of
> its low latency, though the choice of working controllers is small.
> I'm on debian stable and am running fluidsynth version 1.1.6
> It it a debian-package special build, built for lowest latency ?
> Why doesn't my fluidsynth do filtering ?
>
> Thanks,  Regards,  Peter Billam
>
> http://www.pjb.com.au      address@hidden     (03) 6278 9410
> "Follow the charge, not the particle."  --  Richard Feynman
>   from The Theory of Positrons, Physical Review, 1949
>
>
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