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you mean this. ADSR= Attack, Decay, Sustain, Release are envelope generators
Attack- determines how much time
it will take for an audio signal level to go from zero to maximum level when a
key is struck
For the envelope that is controlling the filter, the Attack
controls how long it will take the filter to open to it's maximum brightness
Decay- how long it will take for the envelope
to fall to it's sustain level and determines how far to close the cut off frequency in the filter before it falls to it's sustain level
Sustain-the envelope
controls how much signal can pass through when the note is being held
Release- The Release stage of the envelope starts when the gate signal to the
envelope generator ceases. The amplifier's output is dropped down to zero at the rate
determined by the Release parameter and when the filter returns to it's original
cut off frequency
there are other envelope generators such as DADSR (Delay, Attack, Decay, Sustain, Release)
and ADS (Attack, Decay, & Sustain)

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