Tools

Tools in Yonder are either in the Create menu if they make modifications to the currently lodaed soundbank, or under Tools if they use more/less than a single soundbank.

Tool	Summary
Simple Sounds	Setup a new play/stop pair that plays a single sound.
Replacing Music	Let's you replace music files with ease.
Batch Sound Builder	Use this if you already have a bunch of simple sound files for which you want to setup events. Very useful for porting DS3 sounds.
Boss Bgm	A custom boss needs custom music, and this tool will set it up for you.
Area Bgm	Create a new background music track playing in specific map regions.
Mass Transfer	Let's you move sounds between soundbanks.
Unmangle	Cleans up some stuff Fromsoft added that would otherwise prevent your edits from taking effect.