: This tool analyzes an audio file's sonic profile to suggest a logical starting point for a master. It allows users to choose between "Modern" or "Vintage" vibes and sets loudness targets specifically for streaming services or CD distribution. Master Rebalance
This is the "magic" tool. It allows you to adjust the volume of vocals, bass, or drums after the song has already been mixed into a single stereo file.
Here’s a factual, interesting report on the topic, focusing on what you should know before searching for a download.