Function XPLMSetAudioPosition 

pub unsafe extern "C" fn XPLMSetAudioPosition(
    fmod_channel: *mut FMOD_CHANNEL,
    position: *mut FMOD_VECTOR,
    velocity: *mut FMOD_VECTOR,
) -> FMOD_RESULT

XPLMSetAudioPosition

Move the given audio channel (i.e. a single sound) to a specific location in local co-ordinates. This will set the sound to 3D if it is not already.