Yamaha DX7 II FD Reference Manual page 22

Ld!Rd
The Ld (Left depth) and Rd (right depth) parameters determine the intensity with which
the scaling curves will affect the selected operator's output level as keys to the left or right
of the break point are played.
0 Left or right scaling curves will have no effect on the output level.
99 Left or right scaling curves will have maximum effect on the output level.
Fractional Scaling
Fractional scaling provides you with even finer control over the relationship between
output level and key position than normal scaling. The output level of each operator can
be scaled independently for individual groups of three keys across the entire keyboard.
This allows you to create your own scaling curves to fit any type of voice.
To display the fractional scaling parameters, press the Output Level button (#10) until you
see the scaling mode screen. Select fractional scaling and press the Output Level button
again.
Ofst The Ofst (offset) parameter allows you to increase or decrease the overall level setting of
all key groups (each consisting of three keys).
-127 Decrease all level settings by the maximum amount
0 Leave level settings unchanged.
+ 12
7
Increase all level settings by the maximum amount.
This parameter is a great help when you have just finished adjusting twenty key groups
and you would prefer generally higher or lower level values.
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