On 05/23/2017 06:33 AM, Marcus Weseloh wrote:
2017-05-23 14:00 GMT+02:00 Kjetil Matheussen <k.s.matheus...@gmail.com
<mailto: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?
Cheers,
Marcus
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I have been using FluidSynth for years, by way of the Qsynth GUI
interface, with a synthesizer having aftertouch (which it actually does
by sending Channel Pressure MIDI control messages).
It has always had the same effect as the modulation control message.
With the FluidR3_GM soundfont (which comes with Qsynth as a dependency),
the Modulation control often produces a non-pleasing sound, so I
actually removed the Channel Pressure messages from my MIDI sequences.
With other soundfonts, the Modulation messages (and therefore the
Channel Pressure messages) are useful.
It has had this behavior for over 10 years.
Polyphonic Aftertouch may be different from Channel Pressure. I am
talking about Channel Pressure, which my synthesizer uses.
--
Sincerely,
Aere
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