I don't know the micro ensemble, but morst kurzweils have three midi settings.
local - midi - both

step 1. choose midi transfer channel
step 2. choose midi since you control the ensemble thru the rd 300.

Hope this helps.

Fred
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76