Just select the layer R1, R2, L1 etc that you wish to change and the rest of the voices (Layers) will stay the same.
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Thx Bill,but there's no way around trying to modify a voice in the R2,R3/Left-position,without the keyboard always defaulting to the R1 voice only in
'custom voice' mode.(Psr9000)
Sure would be nice to be able to freeze say R2,while changing to a different registration bank.