Lunar Rover on the Moon Version 4...Press + on the Numpad for Throttle , use 1 and 2 on the numpad for steering...When stopped Press K to change into reverse Gear, then press - on the numpad for reverse Throttle, and repeat the process to change back to Forward Gear.(Version 4 has Steerable Wheels)..Has Engine Sounds (needs OrbiterSound 3.5Â or higher installed).Unzip into your Orbiter folder.(Make sure - Use Folder names is ticked when using winzip.)**Made for Orbiter 060929 with OrbiterSound 3.5 Only**..