Mixing and mastering

Mastering is the last step before release: the final balance of tone and loudness that makes a song sound finished next to other songs on a playlist. AI mastering services take a stereo mix, analyze it and apply that last stage automatically, usually in a few minutes and with a choice of styles or loudness levels.

For an independent band they solve a practical problem. You have a stack of demos, a single you want out next month and no budget to book an engineer for every track. An online master from a service such as LANDR, eMastered or Mixea gives you something release-ready quickly, and you can compare a few versions before you choose.

The catch is that mastering can only work with what the mix gives it. If the vocal is buried, the kick and bass fight each other or the cymbals are harsh, an automatic master will make those problems louder. Spend your effort on the mix first, leave a little headroom, and then master. A simple test is to compare your master with a commercial reference track in the same style at matched loudness.

Assistant plugins work earlier in the chain. Tools such as sonible's smart plugins and Soundtheory's Gullfoss listen to a track and suggest or apply EQ and dynamics settings, which you then adjust. They help a band member who records the band at home and wants a sensible starting point. The open-source Matchering takes a different route: give it your track and a reference song you like, and it matches loudness and tonal balance to that reference.