Im looking for an audio enhancer that is either cheap or free that will run on Mac. I fully understand that cheap/free audio enhancers are not going to produce professional grade quality. I have always loved rap music, and i have always enjoyed writing music as well. Therefore I decided to make a mixtape for fun and to compare my writing abilities to other artists. So i am just looking for a software that will make my audio quality better at a fair price and or free if at all possible.

Will +rep if you can help me out, Thanks