Here's the code for the xScale channel, to mirror prop 'lefthand' along the x axis (in the yz plane): valueParm xScaleMaster { name xScaleMaster initValue 1 hidden 0 forceLimits 4 min -1 max 1 trackingScale 0.004 keys { static 0 k 0 1 } interpStyleLocked 0 } scaleX xScale { name GetStringRes(1028,6) initValue 0 hidden 0 forceLimits 0 min 0.001 max 100000 trackingScale 0.004 keys { static 0 k 0 0 } interpStyleLocked 0 valueOpDeltaAdd _NO_FIG_ lefthand xScaleMaster deltaAddDelta 1.000000 }