Exp
linear(time,thisLayer.inPoint,thisLayer.inPoint+1,0,100)
linear(time,thisLayer.outPoint-1,thisLayer.outPoint,100,0)
thisComp.layer(index-1).transform.opacity.valueAtTime(time-1)
linear(time,thisLayer.inPoint,thisLayer.inPoint+1,0,100)
linear(time,thisLayer.outPoint-1,thisLayer.outPoint,100,0)
thisComp.layer(index-1).transform.opacity.valueAtTime(time-1)