One of the main tools of tuning sounds is to apply various effects through Filters and Reverb Zones.
Filters can be attached to the specific Audio Sources via components or Sound Groups inside Audio Mixer with an Add… button at the bottom of the group.
Note
Adding Filters to Audio Groups is the preferred way. Filters as components exist for backward compatibility with older versions of Unity that didn't have audio mixers
Filters affect specific audio sources that they are assigned to (and its hierarchy, in a case of audio groups). We will not discuss any filter in particular, due to their situational nature; however, keep in mind that the order in which you apply filters does matter a great deal, you might not always perceive the difference, but it is there.
Reverb zones are slightly different; they are the spherical volumes (components) that you place in the level to add a reverb to the Audio Sources if the Audio Listener is within the Reverb Zone area.
Let's take a look...