Robbo, You can assign an on screen position to show transpose. I have mine showing on the bottom of the screen. Not got my keyboard in front of me at the moment but I hope I have sent you to search in the right direction.
Cheers Carol
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Genos, V-Console, Korg Pa2x, Technics KN7000, Roland. BK-7M Module, Korg Micro Arranger.