Kawai MP8 Owner's Manual page 28

Note:
When the selected zone is set to INT only the following parameters can
be selected.
10 Panpot PAN
11 Expression EXP
70 Sustain Level STN
71 Resonance RSN
76 Vibrato Rate VbR
77 Vibrato Depth VbD
78 Vibrato Delay VbY
93 Chorus Depth ChD
When the selected zone is set to BOTH and the internal section is
selected in edit mode, the parameters not available for INT section show
as XXX.
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