1. Plug a Yamaha FC-4 or FC-5 into the assignable footswitch jack.
2. Press the [UTILITY] button.
3. Press the Page [>] button several times until the 'Ctrl Asn Ctrl No.' screen is displayed.
4. Turn the left [KNOB] under the Display until 'FS' is displayed.
5. Turn the center [KNOB] under the Display until '66- Sostenut' is displayed.