 During fast winding operations the pinch roller is disengaged and the take up reel motor is supplied with a higher voltage than the supply motor.The cheapest models use a single motor for all required functions; the motor drives the capstan directly and the supply and take-up reels are loosely coupled to the capstan motor with slipping belts, gears or clutches.There are also variants with two motors, in which one motor is used for the capstan and one for driving the reels for playback, rewind and fast forward.