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Mirror function for FAN CENTER
When you have e.g. 8 Moving Heads in a line, the FAN CENTER function works perfect
for spreading the light over the stage widht by fanning the PAN from the middle to the outsides,
because PAN values of leftsided moving heads are decreased while PAN values of rightsided moving heads are increased.

But there is no possibility to spread the light from the back of the stage to the front of the stage by fanning the TILT values
where the centered moving heads remain in the back an the further away the moving heads are from the middle position on the truss,
the further the light should shine to the front of the stage. If you try that with the FAN CENTER function, the left sided moving heads
decrease their TILT to shine further to the back, while the right sided moving heads increase their TILT values to shine further to the front.

I think of an additional FAN CENTER MIRROR function, where the values are still fanned from the center position, but both fixture selection parts 
(leftside / rightside) have the same sign (+ / -) for the change of the parameter value (PAN / TILT / FOCUS, etc.).
And this method for fanning values would also be very useful for fanning individual parameter timing (think of a delayed fade in of the fixtures from the center to the sides).

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