Question concerning gobo & color rotation/spin

I am using an iPC on the Hog 3 platform and am unable to get the gobo's to rotate couterclockwise. The same applies to gobo wheel and color wheel spins. The parameter wheel only allows me to go from 0rpm's to 300rpm's but not to -300rpm's. In the "Edit Fixture" window the parameters are set to range from -300 to 300 but it is not working. Is there a way around this problem.

Thanks.
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