Sequential PROPHET-600 - 7-7 AMPLIFIER

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ATTACK DECAY
SUSTAIN RELEASE
Figure
7-7
ATTACK
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: Adjusts
the !ene:h of line lor
the
envelope to go
from
zero
level
(when key is initially depressed) to
maximum level.
DECAY knob: Adjusts
the length
of
time for the envelope to go from maximum
level
to sustain level.
If
SUSTAIN is set at maximum then
the DECAY knob setting is irrelevant, because
there
is
no level below maximum for the envelope to decay to.
5USTAIN
knob: Adjusts the
sustain
level from zero
to
maximum. Remember, this is a
level control, not a time control. (Sustain time is the period between the end of the
DECAY period and the
beginning
of the
RELEASE period. This is determined by
touch.)
RELEASE knob: Adjusts the length of time for the envelope to go from sustain level to
zero.
If the key is released before the attack or decay periods have elapsed, the RELEASE
knob controls the time taken for the envelope to drop to zero from its level when the
key was released.
If the
attack
and decay periods
have
elapsed and
SUSTAIN
is set to 0, then the
RELEASE setting is irrelevant, because there
is
no level for the envelope
to release
from.
.
.
7-7 AMPLIFIER
The sole amplifier controls are the
envelope
generator
ATTACK,
DECAY, SUSTAIN,
and
RELEASE knobs, which shape the envelope applied
to
the VCA
as
described above.
These knobs control the note dynamics.
Unless the SU5TAIN knob is turned up somewhat,
nothing
will be heard after the
ATTACK
and DECAY periods
have
elapsed.
To prevent an audible click caused by the instantaneous closing of the amplifier, the
RELEASE knob should normally be
set
slightly above 0.
CM600A
12/82
7-7