keynum to hold/decay is broken after commit 11ee3a9

[S. Christian Collins]

After commit 11ee3a9 (Sound engine more independant), keynum to hold/decay no longer works.

Steps to Reproduce

1. Load the attached SoundFont into Polyphone.
2. Play notes on the first preset—be sure to hold each key down until you no longer hear any sound. As you go up/down from middle C, you should always hear exactly two finger snap sounds. In the high register of the keyboard it will drift into 3 snaps, so ignore that. Presets 000 and 002 test keynum-to-hold for the volume and mod envelopes respectively. They should sound similar to one another. Presets 001 and 003 test keynum-to-decay, and in this case, you will hear the second snap much more faintly or highly filtered.

Actual Result

High notes play more snaps, and low notes play fewer snaps.

Expected Result

Notes all across the keyboard should play only two snaps as the hold/decay values are being adjusted based on MIDI key number (except at the top of the keyboard, where the math gets off a bit).

[Davy Triponney]

Thanks a lot for this finding and for the soundfont! It's now fixed

[S. Christian Collins]

Thanks, Davy, for the fix and for your continued work on this editor. It is my lifeblood right now! I'll go ahead and give the update a test. Peace 😁

[S. Christian Collins]

I can confirm this bug is indeed fixed!