SoSciSurvey - Hide submit button until first audio on page played

HTML Snippet.html

<script type="text/javascript">
    SoSciTools.submitButtonsHide();

    SoSciTools.attachEvent(window, 'load', function () {
        let audio = document.getElementsByTagName('audio')[0];
        audio.onended = () => {
            window.setTimeout(SoSciTools.submitButtonsDisplay, 1000);
        };
    });
</script>