In multiplex mode, if the S input is 0, there will be no output at Z
Positive S outputs the X input multiplied by S.
Negative S outputs the Y input multiplied by -S.
Used with a biplor logic signal, this behaves like a switch.
In crossfade mode, an S value of 0 will add X and Y equally.
Positive S outputs the full value of X plus the scaled value of Y.
Negative S does the opposite, keeping Y at full volume and scaling X.
In crossfade2 mode, an S of 0 will output ½(X+Y).
As S goes more positive, X will increase in volume, while Y will decrease.
Negative S does the reverse.
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