HTML/CSS/Basic Attributes/volume
"volume" indicates the sound clip volume
<HTML>
<head>
<bgsound src="yoursoundfile.wav" balance="0" loop="1" volume="-500">
</head>
<BODY>
</BODY>
</HTML>
<HTML>
<head>
<bgsound src="yoursoundfile.wav" balance="0" loop="1" volume="-500">
</head>
<BODY>
</BODY>
</HTML>