|Re: [fluid-dev] New patch: polyphonic key pressure (aftertouch)
|Tue, 23 May 2017 14:43:56 +0200
2017-05-23 14:00 GMT+02:00 Kjetil Matheussen <address@hidden>:So when fluidsynth receives these bytes:0xa0 0x60 0x100x90 0x60 0x70Is the note played with a volume value of 0x10?That depends on the modulators on the instrument. Polyphonic aftertouch is not one of the standard modulators, so it needs to be explicitly added to an instrument / preset. On the standard FluidR3_GM font, your example would play with volume of 0x70, as there is no polyphonic aftertouch modulator on any of the presets.If you add a Key Pressure -> Initial Attenuation modulator and leave the default Velocity -> Initial Attenuation modulator in place, then those two modulators will work in combination. So in that case: yes, sending aftertouch before note on will affect the initial volume of the sound. But it probably wouldn't be 0x10 in your example, because the velocity also adds to the volume through the default modulator.By the way, that is (as far as I can tell) exactly the same behaviour as in the already implemented Channel Aftertouch event. Channel aftertouch is always accepted and stored on the channel, even if no note is currently playing and it is also not reset on note off. But Channel Pressure / Aftertouch _is_ one of the default modulators and is mapped to LFO Pitch Depth. So if we switch your example to Channel Pressure:Channel Pressure: 127Note On: 60 127then that note starts with maximum volume and maximum LFO pitch depth.In case, that doesn't seem right...
Ok... but what _is_ right? :-) And if that's not right, is the existing channel pressure also wrong?
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