Re-Master a track
I’ve cut and editted a track from a website, which was never released.
However I can’t play it, because it sounds too slim. The quality and gain is OK, however bass etc. isn’t fat enough.
You know good tools to improve it without much quality loss?
run it through audacity and tweak eq in there?
Izotope Ozone4 VST 
Its comercial version but it is a great mastering tool. Lots of presets , pargraphic eq, stereo widening, volume opt … etc great and non destructive. I love it!
Any limiter/maximizer will do the job and please, don’t run the track in Audacity it will sound worse.
ooowh fight fight fight 
Audacity is a good program for the price, but it aint no adobe audition guys.
Wow this plugin looks wicked i’m gonna get it.
meh, he’s right, just thought i’d throw a freebie option in