Yamaha Electone EL-57 Owner's Manual page 124

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3) Tremolo Control
Selection of footswitch control over Tremolo. Pressing the footswitch
turns the Tremolo effect on and off (Chorus), performing the same
function as the TREMOLO (FAST) button in the DISPLAY SELECT
section.
If you want to use this function, the tremolo settings require to be set
properly. See page 36 for more information.
2 Knee Lever
The knee lever, located on the underside of the keyboard panel, can
be used to turn on and off the Sustain effect and Melody On Chord
function.
1) Sustain
To select knee lever control over Sustain:
1 When the knee lever is folded up
2
2 When the knee lever is vertical
3 When the knee lever is continuously pressed to the right
3
2
FOOT SWITCH-LEFT Page—Tremolo
Make sure that the Upper and/or Lower Sustain effect panel
controls have been turned on; otherwise the knee lever will have
no effect.
Fold the knee lever down.
Press the knee lever to the right with your knee when you want
to have sustain.
The sustain effect is applied constantly,as long as the front panel
sustain buttons are on.
The sustain effect is cancelled.
The sustain effect is on.
SUSTAIN
UPPER
(KNEE)
LOWER PEDAL
(KNEE)