Here's a section from the manual that loosely explains the concept[1]:
> Adjust a slider or dial’s value by dragging up and down, or left and right for horizontal sliders. For finer control, move your finger away from the dial.
My only Apple product is also an iPad, and I mostly use it to make music with Auxy Studio:)
Do you use any fun apps on Android? Currently, my favorite apps are Digitron and Nanoloop. (No affiliation, but Digitron's upgrade was gifted to me.)