A dynamic drive and brake system is provided. Live video signal data is vertically scaled. This control can occur during a downshift, for example, when the second one of the plurality of speed ratios is numerically greater than the first one of the speed ratios. A payment process, for payment of the total commitment receivable value by a first party to the second party, is initiated. Posted barter orders from the display are selected to effectuate a barter transaction which combines a barterer’s barter order with the selected posted order.