How can I stop a audio when I put it to MMDAnimationHelper

Questions
1 
if (value) {
		audio.play();
		helper.add(audio);
						
} else {
		helper._clearAudio(audio)
		audio.pause()
}

I try to do this,but after my audio is over,there is a little part of the audio playing.This lead to next Animation and audio are not synchronized