Yamaha Electone STAGEA ELB-01 Playing Manual page 5

Right foot
Put your right foot on the Expression pedal. Be careful to keep your original posture
when you use the pedal, since moving the pedal with your foot may throw your body
slightly off balance.
Expression pedal
Turn on the Electone by pressing the [POWER] switch.
Set the MASTER VOLUME control and press the Expression pedal down with your
foot. The more you press down, the greater the volume.
That's it! Now, you're ready to play the Electone.
Playing the ELB-01 — Tutorial 5