➟ Back to About openBVE About 3D positional audio  In openBVE, every sound has an explicit position in 3D coordinates from which the sound is emerging, along with a velocity vector indicating the direction the sound is moving to. Similarily, the camera has a position and a velocity vector, but also additional directional vectors indicating the orientation of the camera. OpenAL, the library which is used for sound effects, makes use of these properties to allow for distance attenuation and doppler effects. All of the sounds in a train are assigned a specific position from which they are emerging. With a surround speaker system, you will therefore be able to hear different sounds emerging from different directions. As such, openBVE is best enjoyed using a 5.1 speaker system or similar. Users should further read the section about Sound configurtion in order to make sure that sound is played as intended. Developers should read the section about supported audio formats on the Developing for openBVE pages.