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Envelopes
The envelopes control the filtering and volume of the sound to create movement within a note.
The filter envelope controls the filter cutoff frequency. The volume envelope controls the
output amplitude of the sound.
Attack is a measurement of the time it takes the envelope
to go from zero to full amount in the initial phase. The
attack time ranges from 1 millisecond to 10 seconds.
Decay
Decay is a measurement of the time it takes the envelope
to go from the maximum to the sustain level in the second
phase. The decay time ranges from 1 millisecond to 10
seconds.
Sustain
Sustain is an amplitude measurement. It is the settling
amplitude of the third phase of the envelope, while a key is
held.
Release
Release is a measurement of the time it takes the envelope
to go from the sustain level back to zero when a key is
released.
When a key is press the first three phases occur. When the
key is released the Release phase occurs.
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