My fave UI was a single large rotary knob showing a physical colored 'ribbon' that starts at zero and goes up/fills-in on turning. The first 5 mins had higher r

My fave UI was a single large rotary knob showing a physical colored 'ribbon' that starts at zero and goes up/fills-in on turning. The first 5 mins had higher resolution then less beyond 5 mins. You could also rotate it while on to increase/decrease. It's hard to beat combined input/display using a single continuous mechanism like level faders on an audio mixing board.