I’m animating a volume slider in my project, sliding a thumb left to right is working, but how do I animate the ‘active’ part of the slider. E.g. moving the slider from left to right and masking (?) the active part of the slider. I have a background layer, a colored layer on top of it showing the height of the volume and the thumb on top of that. Sliding the thumb would enlarge/shrink the colored layer and show more/less of the background layer. Thanks a lot guys!