audio-setup-mixers

From README

Audio Mixer Routing an Audio Source to a mixer group is a scene edit that only a running Editor can make, so this skill needs a live Editor it can execute C# in. Step 0 establishes that before anything else. What this skill automates, and what it hands back to you. Inspecting mixers and routing Audio Sources into groups is entirely public Unity API, and that is the tedious part — walking dozens of sources and classifying them by what they play. Creating a mixer or a group has no public API; it exists only on types Unity does not commit to keeping stable. So this skill will not create groups behind your back. It inventories what exists, proposes the routing, asks you to add any missing group in the Audio Mixer window, and then does all the routing itself. That is a deliberate limit, not a gap to work around. Do not reach for reflection to create groups, and do not hand-edit a .mixer file — mixer structure is not safely authorable blind.