Diode Equation Funs - Kurzweil K2661 Musician's Manual

FUNS
The FUN Equations
Sample b On a
This is a sample and hold function. The values of Inputs a and b are interpreted as logical
quantities, as described for the equations a AND b, a OR b. When the value of Input a changes
from FALSE to TRUE (goes above +.5), the value of Input b at that moment is sampled
(recorded), and becomes the FUN's output value. This value remains constant until Input a
makes another transition from FALSE to TRUE.
Sample b On ~a
This works like the previous equation, but the value of Input b is sampled whenever the value of
Input a makes a transition from TRUE to FALSE.
Track b While a
This equation also interprets the values of Inputs a and b as logical quantities. While the value of
Input a is TRUE, the value of Input b is used as the FUN's output value. The output value
changes exactly as the value of Input b changes. When the value of Input a goes FALSE, the
FUN's output value freezes and remains constant until the value of Input a becomes TRUE
again. The FUN's output value then continues to track the value of Input b.
Track b While ~a
This is the opposite of the previous equation. The FUN's output value tracks the value of Input b
as long as the value of Input a is FALSE.

Diode Equation FUNs

The remaining equations perform a diode-like function; only positive input values are
significant. If the result of the equation is negative, the FUN's output value is 0. You can use
these equations to limit bipolar control signals to unipolar values. Normally you'll use these by
setting Input a or b to ON or OFF, and assigning some control source to the other input. These
will enable you to produce a variety of output curves.
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