A free mod for Witcher 3, by Murzinio.
This add-on is for people who like to create their own custom sound effects (SFX) or re-shade (ReShade) a game. It allows you to create 6 different presets for your game and use them as a quick way to change your gameplay.
To create a preset, you need to download the file you want to edit and then open it with a text editor. You will see a bunch of text, which you need to copy. You will also see a couple of other files. These are the instructions for the creation of the preset. You need to make sure that you are using the latest version of the game. You will also see a list of other presets that you can download. These will be used as a reference.