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

2

try this code.
I asked this before. (It’s hidden post now…)
in my cases, it worked strangely.

let helper, clock; //mmd helper things...
let isStop = false;
//rendering function example.
const animate = () => {
    requestAnimationFrame(animate);
     if (!isStop) {
        helper.update(clock.getDelta());
        //placehere your rendering code.
    }
};

//pause;
isStop = true;
helper.audio.pause();
clock.running = false;
//resume
isStop = false;