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Use the ES2 dynamic stage in MainStage
The dynamic stage of a synthesizer defines the level, or perceived volume, of a played note. The change in level over time is controlled by an envelope generator. For more information about envelope generators, see Synthesizer basics overview.
ENV 3 is hard wired to the dynamic stage of the ES2—it is always used to control the level of each note. See ES2 envelopes overview.
The dynamic stage can be modulated by any router modulation source.
Modulate the ES2 dynamic stage (Amp)
In MainStage, set up a modulation routing as follows: modulation target AMP, source LFO1.
Make sure that via is set to Off.
Adjust LFO settings.
A tremolo effect is created, with the level changing periodically, based on the current LFO 1 Rate value.