Yamaha MU100 Owner's Manual page 128

2 Use the VALUE -/+ buttons or data dial to change the destination
Performance number.
3 Press the ENTER button to actually execute the Store operation.
An "Executing..." message flashes in the display during the
operation. When the data has been stored, the MU100 returns to
the Performance Edit menu.
To cancel the operation without saving, press the EXIT button
(before pressing ENTER).
Use these to change Performance number.
Performance Mode
Copy and Store Operations
Performance number
131