In audio engineering, a bus[1] (alternate spelling buss, plural busses) is a signal path which can be used to combine (sum) individual audio signal paths together. It is used typically to group several individual audio tracks which can be then manipulated, as a group, like another track. This can be achieved by routing the signal physically by ways of switches and cable patches on a mixing console, or by manipulating software features on a digital audio workstation (DAW).

Using busses allow the engineer to work in a more efficient way and with better consistency, for instance to apply sound processing effects and adjust levels for several tracks at a time.

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  1. ^ Izhaki, Roey (2 May 2013). Mixing Audio: Concepts, Practices and Tools. Taylor & Francis. p. 100. ISBN 9780824775667. A bus is a common signal path to which many signals can be mixed.