I'm not sure at all about switching the Multi/Multi-single mode on remotely. I wouldn't be surprised if it could be done, but having a quick look through the parametres I wouldn't have a clue how to do it.
The only thing I didn't try (just thinking about it now) is trying to record the actual button presses to midi. I'm not even sure if those buttons transmit midi data, but that may work. I'll let you know.
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