Help me adjusting background sounds

Recently I’ve been a frequent visitor at this site for free ringtones. I kinda like this site because it has videogames and cartoon sections. Anyway, whenever I press the audio preview button, it comes up with midi sounds in the background. What annoys me is that I’m unable to keep the volume down by using the slider in my volume control. Everytime I preview the tone, it will always go back up to the max level. This is not the only website that I’m having problem with, but with the others I can just mute it. Anyone has any idea how to keep this volume at the state that I want?