Roland S-220 Owner's Manual page 108

WHAT TO DO
@ [f the MIDI Message Indicator is dark:
@ MIDI connection is not made properly.
@ MIDI channels are not set properly.
@ The Volume Knob is set to the MIN position.
@ When the Multi Function is in use:
108
@ BEND RANGE is set to 0.
VIBRATO in the Wave Parameter section is
set to OFF.
MODULATION in the MIDI Function section is
set to OFF.
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