Yamaha Electone EL-900 Owner's Manual page 113

Adjust the RR (Release Rate) parameter.
Play a note on the keyboard and then release it. Notice how the
changes affect the tail end of the sound, just after you release the key.
By changing this parameter, you can make the sound sustain beyond
the release point (lower settings).
2
Keeping Operator 1 on, select and turn on Operator 2, then adjust
the Operator level.
Adjust the OL (Output Level) parameter.
Use the Data Control buttons below OL (Output Level) to change
the level of Operator 2. Notice that the volume of the sound doesnﾕt
change, but the tone does. Increasing the level of one of the top row
Operators generally makes the tone of the Operator below it brighter
or more metallic. Decreasing the level has the opposite effect.
3
Turn off Operators 1 and 2, and turn on Operators 3 and 4.
Make some changes to their parameters, as you did with Operators 1
and 2 in steps #1 and #2 above. Set the OL of the Operator 3 to 110.
About the Operators
Changing the level of one of the top row Operators (2 and 4 here) affects
the tone of the Operator below it.
Changing the level of one of the bottom row Operators (1 and 3) affects the
volume of the related top row Operator.
NOTE:
Raising the OL of the Operator 2 to make
the sound brighter and lowering the AR
of the Operator 2 can produce a distinctive
effect.
NOTE:
No sound will be produced nor will
adjusting the top row Operators have any
effect if all of the bottom row Operators
have been turned off or set to their
minimum level. Be sure to turn on the
bottom row of Operators and set them to
a suitable level before changing the
parameters of the top row Operators.
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