Thanks for the responses, but is there any chance I could see a basic setup?
It would save me hours or maybe even days of having to rip my hair out, and just to be clear, although it would be cool to see how it's done, I'm not talking about the inertia or ballistics that are involved then a real vinyl is spinning. I literally just want to map the minimum value of a knob to the start of a sample, and the maximum value to the end so that no matter what length the sample is, I can scrub through it start to end in forward or reverse using a knob.
Encoders are a big no for the sort of thing I mean, but again, even an example of that would be great, anything to put me (and anyone else who's curious) on the right track.
So I'm after a crisp, exact response to turning the knob, it should feel like the sample is directly connected to the knob. The standard resolution of MIDI should be no problem, cause if it works ok, I hope to rig-up a physical analogue pot to it, hopefully an industrial grade one that will take a super-sized knob to make in nice to use.