Kawai MR3000 Owner's Manual page 26

(3) Press the PIANO1 switch to enter the CHANNEL SELECT mode,
and select MIDI Channel 12 or 13 (see p. 16).
(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 PIPE ORGAN and BELL timbres
allotted to Channels 12 and 13 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.