Yamaha Electone EL-57 Owner's Manual page 40

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3) Tremolo/Chorus
Tremolo recreates the rich, swirling sound of the popular rotating
speaker effect. Just as with a conventional rotating speaker, you can
switch between slow and fast speeds. And like a motor-driven speaker,
the characteristic tremolo effect gradually changes speed after it is
switched. You can also adjust the maximum speed of the effect to suit
your playing style. The Tremolo effect can be switched in real time as
you play with either the front panel button or the left footswitch (when
properly set for footswitch operation).
Tremolo Operation
Turn on Tremolo effect in each Voice Condition page 1.
Adjust the Tremolo setting in Tremolo Control (or Effect Set) page.
Assign footswitch for Tremolo Control, if desired.
Turn on Tremolo as you play, with Tremolo button or footswitch.
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