3.5
Envelope
Generator
Control
(cont.)
Fig. 7
Attack when set to logic “1": the envelope counter will count up
(attack) from E3 E2 E1 E0=0000 to E3 E2 E1 E0=1111;
when set to logic “0”, the envelope counter will count
down (decay) from 1111 to 0000.
Continue when set to logic “1”, the cycle pattern will be as defined
by the Hold bit; when set to logic “0”, the envelope
generator will reset to 0000 after one cycle and hold at
that count.
To further describe the above functions could be accomplished by
numerous charts of the binary count sequence of E3 E2 E1 E0 for
each combination of Hold, Alternate, Attackand Continue. However,
since these outputs are used (when selected by the Amplitude
Control registers) to amplitude modulate the output of the Mixers, a
better understanding of their effect can be accomplished via a
graphic representation of their value for each condition selected, as
illustrated in Figs. 7 and 8.
ENVELOPE SHAPE/CYCLE CONTROL
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