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it can only transit CCs on 1 channel at a time.
There's a way around that found on the same MIDI Solutions product page linked by BMF. The Event Processor (or Event Processor Plus) can remap an incoming MIDI message to another message, MIDI channel, or to multiple MIDI messages / channels. Yes, it's yet another small box on the 'board and even more cable routing, but it will double as a versatile toolkit for all kinds of problematic MIDI setups.
It appears difficult to "program", but you do that just once, the settings are retained after power-down, and 9/10 times it can be powered by the MIDI signal itself.
