 The tracks deviate around the circumference and as the drum rotates, the selector forks are moved to select the required gear.A sequential manual transmission is not to be confused with a "sequential" shifting function sometimes fitted to hydraulic automatic transmission, marketed with terms such as "Tiptronic" or "SportShift".This function allows the driver to select the previous or next gear through the use of buttons or a lever (usually near the gear shifter or steering wheel); however, the mechanicals of the transmission remains unrelated to a sequential manual transmission.