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Amp Designer effects overview in MainStage
The effects parameters include reverb, tremolo, and vibrato, which emulate the processors found on many amplifiers. These controls are found in the center of the knobs section.

Reverb, which is controlled by an On/Off switch in the middle, can be added to either tremolo or vibrato, or it can be used independently. See Amp Designer reverb effect.
You can select either Trem(olo), which modulates the amplitude or volume of the sound, or Vib(rato), which modulates the pitch. See Amp Designer tremolo and vibrato.
Note: The Effects section is placed before the Presence and Master controls in the signal flow, and receives the pre-amplified, pre-Master signal.