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Re: [fluid-dev] The missing filter

From: Peter Billam
Subject: Re: [fluid-dev] The missing filter
Date: Fri, 11 Mar 2016 09:56 +1100

Greetings all;  Jean-Jacques writes:

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

OK, that confirms my experience :-)

> For each voice, there is a filter controled by modulation
> envelope 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

Ah ... OK, understood.

cc73 = Attack Time opens up lots of musical possibilites; also
cc66 = Sostenuto Pedal is very desirable, eg to sustain a low
note for a few seconds leaving two hands free to improvise...

One CC which should be low-cpu and easy to implement would be
cc92 = Tremolo Depth, because it only needs one multiplication
and an LFO ...

Thanks,  Regards,  Peter Billam

 It's a shame that the midi standard only offers Depth, and not
 also Tremolo Frequency, because even the earliest guitar amps
 used to have Depth and Frequency, and it's often useful to adjust
 the Frequency to fit the tempo or to give a different "sound".
 But within the standard there's nothing can be done about that.

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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