Use the following procedure to adjust the FP-7F dual play volume:
1. Press the FUNCTION button so it is lit.
2. Use the + / - buttons to the right of the DISPLAY button to select "DUAL BALANCE" in the menu and press PIANO.
3. Use the + / - buttons to the right of the DISPLAY button to adjust the balance.
9 - 1 (TONE 1 is louder)
9 - 9 (Both tones are the same volume)
1 - 9 (TONE 2 is louder)