Final answer:
In Pro Tools, routing is used to direct signals within the software, facilitated by a mix window where tracks have selectors for input and output paths.
Step-by-step explanation:
In professional audio production, specifically within Pro Tools, we use a feature called routing to direct audio signals from one place to another within the software. Signals can be routed to and from different tracks, busses, hardware inputs or outputs, and signal processing plugins. This routing is facilitated by a mix window in Pro Tools, where each track features a set of selectors that allow you to assign its input and output paths. For instance, if you wanted to send the output of a vocal track to a reverb bus, you would select that bus from the output routing selector on the vocal track. Similarly, you can route the signal from your audio interface into a track by selecting the appropriate input.