Something went wrong with my last post and the "hidden 0" line in the valueParm channel ended up in the wrong place. It should have looked like this: valueParm Fit_01 { name FitG4 initValue 0 hidden 0 forceLimits 1 min 0 max 1 trackingScale 1 keys { static 0 k 0 0 } interpStyleLocked 0 }