The sound serial communication from the RCMC is different than the R4LC. Jon Z. is really the guy to ask, but from my recent conversation with him, I think there may be a disconnect or two between the older modular board and what the RCMC says to the RS board. I know that trying to drive the new Legacy RS-Lite boards with a Legacy R4LC is a no-go, that's why I mention it. You get a few functions, but many sound effects aren't happening without having the RCMC drive the serial data to the RS-Lite board.
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