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Sonic Swell

Envelope follower - generates an amplitude envelope triggered by signal level that is then multiplied by the signal to shape its amplitude. You can think of it as an AutoWah for amplitude.

Parameters:

Sensitivity

Signal level in dB required to trigger the envelope
Range: 0.001 to 0.1 (default 0.03).

Attack

Signal level averaging-time in seconds when the signal is coming on ("attack")
Range: 1 to 2000 msec (default 100).

Expert Parameters:

Hold Time

Minimum envelope duration in seconds once it has begun
Range: 0 to 1000 msec (default 0).

Release Time

Signal level averaging-time in seconds when the signal is going away ("release")
Range: 1 to 2000 msec (default 10).