Registers A0H; Registers C0H - Yamaha YM3806 Programmer's Manual

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OPQ Programmer's Guide V 1.1

5.6.2 Registers A0H...BFH: Envelope: decay rate / waveform

TE/RD

DR4...DR0

5.6.3 Registers C0H...DFH: Envelope: sustain rate

SR4...SR0

DR4

Tremolo (AM by LFO) enable. This bit defines whether the channel's

tremolo is applied to this operator.

At the same time, this bit acts as a re-trigger disable. When this bit is

set and operator has a long release time, it won't trigger again before

release curve has decreased near zero.

Why these two completely separate settings are combined to this

same bit, I cannot understand.

Basic waveform of this operator.

0 = sine wave

1 = half-sine

Decay rate 0...31.

0 = very slow (very long decay time)

...

31 = very fast (decay time about zero)

SR4

Sustain rate 0...31.

0 = no decrease during sustain phase (sustain curve is

horizontal, as in basic ADSR)

...

31 = very fast decrease during sustain phase

DR3

DR2

SR3

SR2

DR1

DR0

SR1

SR0

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