A sales and presentation area has an essentially annular region rotatably mounted in the horizontal direction, divided into ring segments able to be moved individually in the vertical direction, and set into horizontal rotational movement via drives during use of the ring segments by customers. Accordingly, analog feedback is used for external integrated circuits controlled by a PWM output, for processes to be analyzed. The torque transmitting devices include clutches and brakes arranged within a transmission housing. Stabilizing of the upper frame is done by turning handlebars.