Javascript simple Audio Volume meter

Question

I am looking for a very simple audio meter in Javascript. I came across this: http://www.smartjava.org/examples/webaudio/example2.html

This is a good example, but unfortunately it uses the web audio API (more info here): http://www.smartjava.org/content/exploring-html5-web-audio-visualizing-sound

This works great, but not on the entire platform; for example, IE does not support it at all. http://caniuse.com/#feat=audio-api

Any idea how to do this in HTML5 using javascript?

I want it to be very simple. I do not need it to accurately reflect the volume. All I want to do is just be able to move any bar when the sound is on.