Minecraft Version

1.20.1

Immersive Engineering Version

10.1.0-171

Expected Behavior

With the Ear Defenders equipped, all specified sound categories, including IE machines, should be muffled at the noise gate threshold.

Actual Behavior

The specified Minecraft sound channels are muffled but IE machines are not.

Steps to reproduce

1. Turn on loud machine (Arc Furnace smelting multiple items at once, Diesel Generator, etc.)
2. Configure Ear Defenders' noise gate to 100%
3. Equip Ear Defenders
4. Loud machine is not muffled

Debug Crash Log

https://gist.github.com/PiecewiseLantern/60679d2aa59846a035fd14a263d95583

Can confirm they don't seem to be working at all.

Yep, was fixed on 1.20.4, but can't easily be backported.
Sorry, wont fix.