ES2 provides additional parameters that can be accessed by clicking the disclosure triangle at the lower left of the interface.
Extended parameters
MIDI Mono Mode pop-up menu: Choose Off, On (with common base channel 1), or On (with common base channel 16).
In either mode, each voice receives on a different MIDI channel. Controllers and MIDI messages sent on the base channel affect all voices.
Mono Mode Pitch Range pop-up menu: Choose 0, 24, or 48.
The chosen pitch bend range affects individual note pitch bend messages received on all but the common base channel. The default is 48 semitones, which is compatible with Mobile GarageBand's keyboard in pitch mode. When using a MIDI guitar, 24 semitones is the preferable setting because most guitar to MIDI converters use this range by default.