Mimi works normally, but when I try to put in midi it even recognizes it and I can play it, but when I put ME in any instrument it simply doesn't make any sound, I've tried everything

(I'm playing on the Craft of Exile 2 modpack (1.20.1)

Hello! Apologies for the slow reply and I'm sorry to hear you're having trouble!

If you are playing SinglePlayer and are able to update the mod to a newer version than the one bundled with Craft2Exile by default I'd recommend tying out the latest 1.20.1 version here:

https://www.curseforge.com/minecraft/mc-mods/mimi-mod/files/6200398

With that version you can open up the MIMI sound settings in-game by pressing the "Home" key on your keyboard. On that screen you can select the audio output device that MIMI should output sounds to.

There has also been a recent issue reported where MIMI sounds are very very quiet if the in-game Master Volume slider is not at 100%. If your Master Volume slider is below 100% try setting it up to 100% and that may also solve your issue!