
Use the ES2 modulation router in MainStage
The modulation router—or router—spans the center of the ES2 interface. Click the Router button to view the modulation router in place of the Vector Envelope. You can hide or show the router/Vector Envelope by clicking the disclosure arrow at the lower left of the section. If you’re new to synthesizer modulation routings, see Modulation overview.

Any modulation source can be connected to any modulation target, much like an old-fashioned telephone exchange or a studio patch bay.
The modulation intensity—how strongly the target is influenced by the source—is set with the vertical slider to the right of the modulation routing.
The intensity of the modulation can itself be modulated: the via parameter defines a further modulation source, which is used to control the modulation intensity. When via is active, you can specify upper and lower limits for the modulation intensity.
Ten such modulation routings of source, via, and target can take place simultaneously. It doesn’t matter which of the ten modulation routings you use. You can even select the same target in several parallel modulation routings. You can also use the same sources and the same via controllers in multiple modulation routings.