I made a tool for my students, so they can slowdown music and learn it in their own tempo.
In the tools there are some knobs, and specifically 3 of them interact to a "loop" functionality. The idea is to have 2 knobs delimiting the start and end of the loop, and the other one the player position that will reposition (go back) when the loop range is reached.
My question is: where in the shape of a knob should the "point of coordinate" be?
For example, in the image under I used the "center" of the knob as the point to measure distances, this makes the knobs go over each other and reduces touch area,
If the "point of coordinate" would be the inner side of each knob relative to each other, where should I position the playing knob?