Jaap wrote:I think the problem probably only appears with controllers because with vinyl you won't do that kind of back spinning like you do with a cdj or something comparable.
Exactly, you can reach speed that are not natural at all, and this why a backspin with a wheel that don't have any weight should always be done with the hands still on it to avoid taking too much rpm.
You can also often hear it with a CDJ, when you set the jog tension on light and do a continuous backspin : the sound speed increase fast, then it reach a point where it will never go faster even if you manage to turn the wheel harder/faster.
Fact : the higher is the frequency, the higher the sound is perceived.
By limiting the speed, you limit the pitch note, you limit the volume.