Yamaha VL-1 Feature Reference page 72

Feature Reference
Upper Depth
Sets the amount of variation produced by the controller assigned to pitch when the
controller is set to its maximum position (e.g. a modulation wheel rolled all the way up).
The higher the value the greater the variation. Positive values cause an increase in pitch
in response to higher controller values, while minus values cause a decrease in pitch in
response to higher controller values. The value of the "Lower Depth" parameter,
below, is automatically changed in response to changes in the "Upper Depth" value
(the "Lower Depth" value is always negative when "Upper Depth" is positive, and
vice versa).
Lower Depth
Sets the amount of variation produced by the controller assigned to pitch when the
controller is set to it minimum position (e.g. a modulation wheel rolled all the way
down). The higher the value the greater the variation. Positive values cause an increase in
pitch in response to lower controller values, while minus values cause a decrease in pitch
in response to lower controller values. Changing the value of the "Lower Depth"
parameter has no effect on the "Upper Depth" value. The "Lower Depth" param-
eter is not available when the "Mode" parameter, below, is set to "Minimum Base".
Mode
Selects the controller value (position) which will produce normal pitch. When set to
"Center Base" a central controller position will produce normal pitch, allowing both
downward and upward variation. A setting of "Minimum Base" will produce normal
pitch when the controller is set to its minimum position, allowing only upward variation.
• Please note that accurate keyboard pitch is produced only when the "Mode"
parameter is set to "Center Base".
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