Kawai MR170 Owner's Manual page 22

(3) Press the PIANO1 switch to enter the CHANNEL SELECT mode,
and select MIDI Channel one from 12/14/15/16 (see p. 13).
(4) Press the CHORUS switch to leave the programming mode.
(5) Connect a MIDI cable to both the MIDI IN and MIDI OUT jacks at
the rear of the piano.
This procedure lets you play in the timbres allotted to Channels
12/14/15/16 with the piano's own keyboard. Moreover, turning on
LOCAL CONTROL as described in step (2) lets you play with the
timbres of the TONE SELECTORS on the panel layered over.
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