Also referred to as the “stereo bus”, the “2-bus,” or the “mix bus”, the “master bus” is a term used to describe the final stereo output of a mix. It is the channel that all the other tracks in a mix are routed through before being sent to the speakers or headphones.

The master bus can be thought of as the “master volume control” for the entire mix. Any adjustments made to the master bus affect the overall level, tone, and dynamics of the mix as a whole. This includes EQ, compression, limiting, and other processing effects that can be applied to the master bus to shape the final sound of the mix.

The master bus is also where the mix is typically bounced or exported to a final audio file, such as a WAV or MP3. This final file represents the completed mix and is often used for distribution, mastering, or further processing.

It’s important to note that the master bus should be treated carefully, as any changes made to it affect the entire mix. It’s generally recommended to make subtle adjustments and use a light touch when applying processing to the master bus in order to avoid damaging the integrity of the mix.

Overall, the master bus is an essential part of the mixing and mastering process in music production and plays a crucial role in shaping the final sound of a mix.