Slider process interaction with layers

Hello,

I have a slider interaction. I have attached the file. What I need to achieve is, when the learner drags the slider as shown in the base layer (The choice 3.1)...as the learner drags the slider slowly along the track, the layer Belgen should wipe in. Also as the slider is dragged along the track to the left, the base layer should appear like as if the belgen layer wipped off to show the base layer. In the SL file, Sc2 is just my various attempt to create the effect but unsuccessful.

Thanks

Sajna