Yamaha VL-1 Feature Reference page 83

Feature Reference
Curve
Determines the relationship between the controller value and harmonic enhancer
depth. When set to "0" the relationship is linear. That is, a change in the controller value
produces a corresponding change in harmonic enhancer depth. As the curve value in-
creases the lower end of the controller range has relatively little effect on the sound while
higher controller values produce more dramatic changes. Negative curve values have the
opposite effect: the sound changes dramatically at low controller values while higher
values produce relatively little effect. The "Curve" setting is reflected in the graph to
the right of the parameters — the horizontal axis represents the controller value and the
vertical axis represents harmonic enhancer depth.
• No harmonic enhancer variation can be applied via any controller if the
ELEMENT MODIFIER Harmonic Enhancer page "Balance" parameter is
set to "-64" (
Edit Mode
Page 108).