Yamaha Electone EL-57 Owner's Manual page 83

EDIT Page
Algorithm and Operator
At the left side of the display is the Algorithm used for this voice.
An algorithm is a kind of "map" that shows how the sound
components of the voice are related to each other. Each voice has
five separate sound components and they are called "Operators."
Begin changing the sound by turning off all Operators, except
Operator 1.
To turn off each Operator:
1 . First, use the pair of Data Control buttons just below the
algorithm display (below the box 1; the second from the left)
to select an Operator.
The currently selected Operator number is surrounded by
the "Brackets."
Pressing the A button move the "Brackets" counter
clockwise, and pressing the B button move the "Brackets"
clockwise. Move the "Brackets" to the Operator 2.
2 . Then press one of the far left pair of Data Control buttons to
turn the selected Operator off.
3 . Repeat the above process for all of the Operators except
Operator 1.
As you turn off each Operator, play the voice and listen to
how the sound changes.
When you turn off the AWM Operator, no sound will be
produced.
NOTE:
The currently selected Operator name
is shown in the dark bar in the middle
of the display.
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