The CP1's Master Keyboard function is designed for use on-stage. Up to individual zones can be setup extending over your selected sections of the keyboard. with Part1 playing on zone1, Part 2 playing on zone2, and external devices responding to notes from zone3 and zone4 assigned to four different tone generators, including other MIDI instruments. Each of these zones has a fixed MIDI channel (see page 52), allowing the CP1 to operate as a Master Keyboard and/or to respond to MIDI messages sent on these channels. Therefore this mode would be a logical choice when transmitting/receiving MIDI messages to/from external MIDI devices.
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