Kawai MP4 Owner's Manual page 27

Note:
When the selected zone is set to INT, only the following parameters can
be selected.
10 Panpot
11 Expression
70 Sustain Level
71 Resonance
76 Vibrato Rate
77 Vibrato Depth
78 Vibrato Delay
93 Chorus Depth
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.
27
PAN
EXP
STN
RSN
VbR
VbD
VbY
ChD