Sure, you have to loop throught each audio elements. See comments in the code below.
let volumeControl = document.getElementById('vol-control');
function setVolume (){
console.clear()
console.log(volumeControl.value)
// Get the array of audio element and loop through them to set the new volume value
Array.from(document.querySelectorAll("audio")).forEach(function(audio){
// if the input value is "", use zero
audio.volume = volumeControl.value == "" ? 0 : volumeControl.value / 100;
})
};
volumeControl.addEventListener('change', setVolume);
volumeControl.addEventListener('input', setVolume);
// On load
setVolume()
<input id="vol-control" type="number" min="0" max="100" value="25">
<br>
<audio src="https://www.soundhelix.com/examples/mp3/SoundHelix-Song-1.mp3" id="bgsound1" controls></audio>
<audio src="https://www.soundhelix.com/examples/mp3/SoundHelix-Song-8.mp3" id="bgsound2" controls></audio>
<audio src="https://www.soundhelix.com/examples/mp3/SoundHelix-Song-16.mp3" id="bgsound3" controls></audio>
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