I'm looking for some information and references on appropriate sampling rates for physical controllers, specifically control surfaces with knobs and faders and so on. Personally I find that around 10-25ms sampling period seems to work fine, but I wonder are there any good studies or definitive results? I want to record incoming control data in Max accurately, but efficiently. Really my question is: how fast or at what frequency can someone typically move a knob or fader? or is it usually limited by the hardware in generally available controllers?