The main reason behind this mod is that i want to make enemies a little harder. At higher level or in case of special enemies they cast illusion spells. Problem is that player can hear those loud sounds easily and detect them from miles away even behind walls.

This mod may be a companion mod to other mods that add enemies that might even spawn near player and initially invisible. You wouldn't hear any trace of them coming. In same sense the muffle spell is intended as a spell to aid sneaking. Who would design a spell for sneaky purpose that also makes loud noises? I would consider such caster a failure of mages college.

Changes to the game:

- Sound effects for casting and leaving invisibility spell are replaced with empty sound files.

- Invisibility and Muffle spells casting type is changed from "loud" to "silent. This may reduce detection distance for enemies, although with some testing i can say they do detect the cast nearby. Use silent casting perk to improve upon that if you wish. This is more of a consistency change.

If you only want to disable sounds from invisibility spell then you don't need to enable ESP at all. I tried to look for a way to control the spell volumes within ESP but i could never find where InvisibilityOut wav file is called from; how it links to the spell. The cast itself i could silence without wav changes and that is applied to ESP too.