Yamaha MU90R Owner's Manual page 57

MULTI MODE
Chorus Return (ChoRtn)
Variation Return (VarRtn)
Transpose (Trans)
4 8
This determines the amount of Chorus return in the overall mix.
This determines the amount of Variation return in the overall mix.
Variation Return is only available when the Variation Connection
parameter is set to SYS. (See page 106.)
This determines the overall Transpose setting of the Parts.
Graphically indicates current Chorus Return setting.
Graphically indicates current Variation Return setting.
Graphically indicates current Transpose setting.