Knob velocity scaling


Hello - I am looking to add fine tuning of values to the behaviour of a knob in a patch.

The knob must scroll left to right through through a large (and changeable) number of samples in a folder from first to last when turning with fast movements. Additionally, I would like the knob to behave in a way that with very slight movements it will scroll through values more slowly/more precisely.

Can anyone offer any help or advice?