Yamaha QY-8 User Manual page 73

2.
Move the cursor down to the On/Off parameter.
3.
Use the [-1] and [+1] buttons to turn the Undo/Redo function on
or off as required.
4.
Exit by either pressing [ENTER] while holding the up cursor
button, or by pressing the left or right cursor button.
Udo/Rdo
ON
On/off
The Option Functions
65