I usually use Cinnamon. In this case, it’s GeckLinux Cinnamon Leap, but the Sound application comes from openSUSE, which gets it from pulseaudio, I believe. In case it matters, the processor is Intel Ivy Bridge (3rd Generation Core) in an HP laptop.
When I use Sound on Linux Mint Cinnamon, the cursor stays on top of the slider when moving from side-to-side. However, when using GeckoLinux Cinnamon, the slider falls behind the cursor, in other words, the further the cursor is dragged to the side, the more daylight is seen between the two. Please fix this bug.