Upload two files: your own mix, and a reference track — any commercial song, a prior release, anything whose sound you want your track to match. This tool analyzes the reference's loudness, frequency balance, and stereo width, then matches your mix to it. This is 'reference mastering,' a real, respected mastering technique used by professional engineers — different from genre-preset tools like LANDR, which apply a generic profile with no reference of your own choosing. Your taste picks the target; the tool does the matching.