I also have an X52. I don’t use it anymore because I felt like it was losing some precision. So I bought the X56 which also has a lot of buttons and switches. The X52 slider does have more travel and it has a graphic showing graduations from low to high. The one on the X56 doesn’t have that graphic but I don’t know why they would make it a slider if it wasn’t suppose to work like a rheostat. I did see the sensitivity adjustments for the slider but I don’t know how to set it yet. Any pointers?