public void setAudio(AudioNode audio) {
        if (this.audio != null) {
            TrackInfo data = (TrackInfo) audio.getUserData("TrackInfo");
            data.getTracks().remove(this);
        }
        this.audio = audio;
        setUserData(this);
    }
sets the audio node to be used for this track

@param audio the desired AudioNode (alias created)
jme3-core/src/main/java/com/jme3/animation/AudioTrack.java