i just started using audacity and i'm loving it! free as in freedom and beer, plus tons of features like multitrack recording. if u're looking to clean up old recordings or mix tracks without breaking ur budget, give
audicity a try - it's got all the basics covered with no fancy bells & whistles that only add complexity.
pro tip: for better sound quality on multi-track projects consider using. wav files instead of mp3s.
link:
https://zapier.com/blog/best-audio-editor