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Fuzz-Wah effect Compressor in MainStage
The Compressor effect is normally used just before the Fuzz (distortion) effect. This allows you to increase or decrease the perceived gain, thus providing a suitable input level to the distortion circuit. You can, however, place the Compressor at any position in the effects chain or can disable it completely.

Compressor effect parameters
On/off button: Turn the Compressor effect on or off.
Ratio knob and field: Adjust the compression slope. The additional gain offered by the compression circuit—when directly preceding the Fuzz effect—lets you create crunchy distortions.