touchmove to only play sound once

Question

Hey I'm making a synth in angular and want to be able to slide my finger on all keys to play the keys like a real synth but when trying to use touchmove it spammes the sound but I only want it to play once is there a better way to do it or am I missing something?

My code down below.

Thankful for any help to figure this out.

    <rect x="71.428571429%"
    (touchstart)="playAudio('F4')" (touchmove)="playAudio('F4')"
    class="st0"/>



    playAudio(key){
        let audio = new Audio();
        audio.src = "../../../assets/synth/" + key + ".mp3";
        audio.load();
        audio.play();
        console.log(key)
    }