What is a Bus (Audio)?

In audio production, a bus is a signal path used to combine and route multiple audio signals to a single destination. It allows several tracks to be grouped together so they can be processed or controlled as a single unit.

For example, multiple drum tracks such as kick, snare, and hi-hats can be routed to a drum bus, where effects like compression or equalization can be applied to the entire group at once. This makes it easier to shape the overall sound of related tracks and adjust their combined level in a mix.

Buses are widely used in mixing and audio routing within digital audio workstations (DAWs) and mixing consoles. They help organize complex sessions, simplify processing, and allow engineers to apply shared effects or adjustments to groups of tracks efficiently.