Roland V-4EX Owner's Manual page 50

Appendices
Key
The transition starts at light areas or dark areas.
204 Key01 The dark part of the A-Bus picture transitions to the light part of the B-Bus picture.
205 Key02 The light part of the A-Bus picture transitions to the dark part of the B-Bus picture.
206 Key03 The light part of the B-Bus picture transitions to the dark part of the A-Bus picture.
207 Key04 The dark part of the B-Bus picture transitions to the light part of the A-Bus picture.
fig.key-icons.eps
204 : Key01 205 : Key02
50
206 : Key03 207 : Key04