Mastering, that mysterious final step of the audio production process, is now available for free! Check out the automatic mastering service LANDR. You can upload an MP3 file and they’ll let you preview your automatically mastered track in just a minute or so. Then you can choose the amount of the effect you desire and get a link to the mastered file to download. Based on years of academic research, the service is meant to work optimally for whatever track you upload. It may never replace an actual mastering engineer, but it’s worth a shot for $0. Comment below if you try it out, and let us hear the before and after versions!