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I dont have an R3 but normally with a vocoder it can depend on the number of frequency bands the vocal is split into.

Old vocoders could be 4, 8 or 16 band, with new vocoders it can be up to 512. Find out if you can change that parameter in the R3 and if so, try changing it.

After reading the manual, I think I've answered my own question...the selected midi channel is global

I'm looking at the R3 for my live setup. I wanna be able to use it as a midi controller for vst's in my laptop and also use it's internal sounds.

Is the R3 midi channel assignment glogbal or can each patch be programmed to transmit on a different midi channel?

cheers