Use this for dense mechanical books that broaden or deepen play without redrawing the whole foundation: optional class or build compendia, advanced character modules, big options lists, granular subsystems packaged as references rather than lore books or runnable scenarios. If you merge scopes later, think of this as “rules-heavy but not core-line and not creature/loot/setting-first.”
These sliders set site audio only, so you can mix against Discord and other apps (phone volume still caps everything).