Modulation routing in ES1 and ES2
ES1 and ES2 provide an easy way to route a control—a modulation source—to part of the sound engine—a modulation target.
ES1 modulation routing
You create an ES1 modulation routing by selecting a modulation target.

The modulation target can be controlled, in amount, with the modulation wheel of your keyboard.
The target you select in the Destination pop-up menu dynamically responds to keyboard velocity.
The amount, or range, of this modulation is determined by the two sliders, Wheel Min and Wheel Max. These determine the minimum and maximum amount of modulation.
ES2 modulation routing
ES2 provides ten modulation routings, in Mod Matrix Slots. Each routing is quite similar to the modulation controls found in ES1.

In the routing shown above:
The modulation target is Pitch123. The pitch—the Frequency parameter—of Oscillators 1, 2, and 3 is affected by LFO2, the modulation source.
LFO2 is the modulation source. The two sliders beside the Source and Target pop-up menus indicate the modulation amount. To make the modulation more intense, drag the slider handles, thereby increasing the range of the modulation amount. The Amount Via slider determines the maximum amount of modulation, and the Amount slider determines the minimum amount of modulation.
The Via control is the ModWhl. Its range is determined by the sliders. The amount of modulation is directly controlled with the modulation wheel of your keyboard. When the modulation wheel is at the minimum setting, at the bottom of its travel, the amount of oscillator pitch modulation is minimal, or off (no modulation). As you move the modulation wheel upward, the frequency of all three oscillators is directly controlled by the LFO (within the range determined by the sliders).
Download this guide: PDF