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When key is pressed, envelope begins at level 0, proceeds to point 1 at rate
1, proceeds to point 2 at rate 2, to point 3 at rate 3. These are all linear (same-
rate) movements. Provided the key is still held, the envelope will remain at level
3. The envelope may loop from or between point 3 and any previous point.
Whenever the key is released, the envelope falls to zero at rate 4. (In the case
of the amplier envelope, level 4 is always 0.) If the ALTERNATE RELEASE
footswitch is held when the release occurs, rate 4A is used instead. In either
case, the release follows an exponential curve to level 4.
Figure 8-4 shows some simple envelopes which would be impossible to do
with the standard ADSRs. In (a) there is an initial delay, in (b) the attack goes
negative then positive (inverted envelope), and (c) gives a double attack.
Figure 8-4
ENVELOPE EXAMPLES
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