Fading NIP

I'm not sure if I'm missing something or it is just impossible, but I'm trying to have manual control of one NIP parameter during a show. Obviously i could select the channel and then select the right encoder and fade it down (it's control speed playback on a video clip) but it would be so much easier if i could have it on a inhibitive sub.That way i could just slow it down as i needed

Thanks in advance

Stu Cross 

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