FFT Equalizer
This page make use of Audio Data API. Currently (April 2011) this feature works only on
FireFox 4
.
Manual
Acoustic
Base Booster
Electronic
Flat
Jazz
Pop
Rock
Small Speakers
Vocal Booster
If your browser doesn't support HTML5 Audio Data API and you want to figure it out how it works, you can just check below as Youtube video.