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OPQ Programmer's Guide V 1.1
5.6.4 Registers E0H...FFH: Envelope: sustain level / release rate
D7
D6
SL3
SL2
SL3...SL0
RR3...RR0
D5
D4
SL1
SL0
Sustain level 0...15. This is the level where decay phase ends and
sustain phase starts.
0 = max level
...
15 = zero level (no sound during sustain phase)
Setting sustain level = 0 also leads to the length of decay phase being
0.
Release rate 0...15.
0 = very slow (very long release time)
...
15 = very fast (release time about zero)
D3
D2
RR3
RR2
D1
D0
RR1
RR0
20
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