<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Test - ByCan</title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<body>
    <audio id="audio" controls autoplay>
        <source src="https://www.soundhelix.com/examples/mp3/SoundHelix-Song-1.mp3" type="audio/mpeg">
    </audio>
    <script>
        $(document).ready(function(){
            var audio = document.getElementById("audio");
            audio.volume = 0.5;
        });
    </script>
</body>
</html>
muted diyip video oynatılmaya başladıktan bir süre sonra sesi açmayı deneye bilirsin