In est, CA automatically ensures that the BGM and BGS you last have playing on a map will always play for that map.
Hailed by some as "the most useful plugin of all time" Consistent Audio (CA) is one of two planned plugins for consistent map state between map transitions, saves, and loads (the second being Consistent Weather (CW)). In est, CA automatically ensures that the BGM and BGS you last have playing on a map will always play for that map. If the BGM or BGS changes, it will become the new "last BGM/BGS" for that map. If you transition to another map, and then back to the first map, BGM/BGS will be lost without the use of parallel events. Not anymore! Likewise, loading a saved game can often result in different BGM/BGS without use of the same events. This is also no longer a problem. BGM/BGS Fadein and Fadeout? Automated for you. BGM/BGS will fade out and then in when changing maps. Fadein is also automatically called whenever a new BGM/BGS plays. Tracking any custom volumes, pitch, and pan for both BGM/BGS are also automated.
To be blunt, the value of this plugin does not lay in its ability to do something that could not be done without events, but rather, to simplify development and testing. With CA, having the BGM/BGS you expect to have playing, playing, is a much simpler task; in fact, no audio parallel events, switches, or variables are necessary!
The only commands you need to make to BGM/BGS are the play and fadeout commands. This logic can be as complicated or simple as you need. Once the BGM/BGS starts playing, everything else is taken care of for you.