Don't look for an analogue solution in a digital world! Forget the
pot, look at encoders. These are basically clever switches designed to
look like pots. Using simple 74** to count the "clicks" of the
encoder, it is possible to save the position and recall a position
without turning the pot to the "old" position, and if you wanted to be
really flash, put some LEDs around the knob as an indicator to the
actual position.