Function XPLMStopAudio 

pub unsafe extern "C" fn XPLMStopAudio(
    fmod_channel: *mut FMOD_CHANNEL,
) -> FMOD_RESULT

XPLMStopAudio

Stop playing an active FMOD channel. If you defined a completion callback, this will be called. After this, the FMOD::Channel* will no longer be valid and must not be used in any future calls.