need to equalize volume of a single track made by appending 3 track

[perfection]

A friend has created a single 15 min mp3 track by editing and mixing 3 seperate tracks into one so that i can use it in a project of mine On playback i find that the volume of the last part of this single (joined) track is louder than the first two. Any way (and which freeware can i use to 'normalize' the entire track so that the volume decicel rise is not apparent. I may not be able to request him to mix the tracks again. Apart from that - what?

Thanks

[Baldrick]

Audacity?

[chowmein]

Best thing would be to splice the track into 2, at the join between the soft & loud parts, and bump up the soft part (or lower the loud part). Audacity or Reaper is best for this job.