On Tue, May 23, 2017 at 2:33 PM, Marcus Weseloh <mar...@weseloh.cc> wrote:
> > 2017-05-23 14:00 GMT+02:00 Kjetil Matheussen <k.s.matheus...@gmail.com>: > >> So when fluidsynth receives these bytes: >> >> 0xa0 0x60 0x10 >> 0x90 0x60 0x70 >> >> Is 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: 127 > Note On: 60 127 > > then 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? > > Thanks for the explanation! It seems seems like polyphonic aftertouch is a more advanced feature than I though, and you know a lot more about this than me. I thought polyphonic aftertouch was just a way to change the individual volume of single notes after they have started playing. It would be very nice to have a simple option for setting the volume of individual notes after they start playing though. But perhaps that would require a different type of extension to fluidsynth?
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