@Override
    public void onTearDown() {
        super.onTearDown();
        if (mInnerSound != null) {
            mInnerSound.onTearDown();
        }
    }
This class wraps a SpatialSound object because a SpatialSound object can't extend both
a Node and a BaseSound.
android/viro_bridge/src/main/java/com/viromedia/bridge/component/VRTSpatialSoundWrapper.java