Exponential release envelopes (enabled by \xy)

[nyanpasu64]

\xy = Enable exponential release (decrease 8-bit volume by volume>>x + 1, every y frames) \00 = Restore instrument release settings

Use an 8-bit volume counter.

=:

• Counter = 16 * register +15
• Counter = chan * instr. If chan, if instr, if counter < 16, counter = 16.
• Varies by chip (FDS, sawtooth, etc).

Every y frames:

• Counter -= (volume>>x) + 1, every y frames
• Write volume>>4 as effective volume.

Channel volume is restored on next note (like Mxy).

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5b/vrc7? Set decay rate to x volume every y frames. For vrc7, any slower should use builtin sliders. For 5B, is 1/4 volume after 64 frames too fast?

[nyanpasu64]

driver is too bigg. adding features will inflate driver but shrink instrument envelope.