The six-speed automatic transmission includes five frictional elements and is efficiently controlled by a minimal number of spool valves and solenoid valves. When at least one between the syntax and the resolution is to be modified, the first portions of the input bitstream are subjected to the required translation, then transferring said first portions subjected to syntax andor resolution translation to the output bitstream. And therefore, the blood-sampling-tube preparation device can be structurally simplified and miniaturized. The method also includes causing the user interface to display the second user video stream in the current presenter position and to display the first user video stream in the secondary presenter position in response to the detecting. The etching gas may also include additional gases such as inactive gases or gases that include the elements H, O, F, He, or C.