[skins]

Go grab yourself some shareware bro!

Go to www.shareware.com and grab an audio editor(preferably a demo like cooledit or somthing simillar). There should be a normalise function somewere in the software (usualy in plugins or effects menu). open it make sure your level is below -0db (preferably -1db) and then normalise. Do this with all you mp3 tunes and they will all be the same vol level. Now sufice to say...you may want to use a compression filter or plugin (should be available in most wave editors). I can't go into the details of how it works(takes to long)but it compresses the dynamics of the whole wave to an even level so the whole wave has constant even volume/dynamics from start of wave to finish (depending on configuration). A compression rack can be configured to compress audio dynamics in loads of ways for different wave dynamics.

(Make sure the section of audio wave your processing is highlighted before using)