Hi Bill, are you a member of psr tutorial forum . There’s a section specifically for sx keyboards and a bunch of experts,
If no one spots your post here, might be worth asking over there. Unfortunately not something I’ve done as my prior keyboard was a Pa4x.
Might save you a lot of work, and sometimes people come up with other good suggestions. We’ve had 3 years plus to work things out.
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best wishes
Rikki 🧸
Korg PA5X 88 note
SX900
Band in a Box 2022