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http://www.mp3louder.com/
MP3 Louder is a free web service that allows you to increase the volume level of MP3 audio files online, tweak the volume level to make the MP3 louder. Boost the MP3 volume online, directly from your web browser. You just need to select the MP3 audio file from the form below and then click the button "Upload Now". After few seconds you will be able to download the new, optimized MP3 song. It is very important that you do not close this web page during the uploading and encoding process.

Always useful and free!