Yamaha AR-80 - Manual (Page 13)

7
3.
Set the MASTER VOLUME control.
The MASTER VOLUME control is an overall control which affects the volume of the entire
instrument.
4.
Press the Expression pedal down with your foot.
Once you have set the MASTER VOLUME control to a suitable level, you can use the Expression
pedal to change the volume with your foot as you play.
Maximum volume Minimum volume
MIN
MASTER VOLUME
MAX