Roland FC-100mkII - About the RRC Mode

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2. About the RRC Mode
(Mode 0, 2 and 4)
The RRC (Roland Remote Control) mode is provided for connecting the
FC~1 OOMK IT to a Roland product that features an RRC IN connector. The
communication format is compatible
with MIDI. However, no channel data is
recognized (including Exclusive) when messages are received, and channel 1
is
always used for transmission.