Good job, John. Very well presented.
I am having a good time getting my duo of the S910 and Korg Micro ready for performance. While the operation is simple enough, I have made some discoveries. First, keep the synchro button off on both machines. This is a no brainer, but many of my registrations include "Synchro Start", and,of course, both arrangers fired up at once.
My solution was to make three registrations on the Yamaha, with 8 programs each, with accomp off. This way, when I want to play the Korg, I chose the appropriate reg on the S910. This gives me 8 choices of sounds on the bottom, and 4 OTS on top. Conversely, when I am playing the 910, I merely hit a registration on the bottom.
Life is good
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact