ExactlySandwich

ExactlySandwich, generally referred to as Sandwich, is a Youtuber and musician who is currently best known for making visualizations of the ULTRAKILL OST, as well as lyrical adaptations of said OST.

He writes original lyrics for the covers, basing them on the game and its lore, and employs Vocaloids (Kasane Teto and Hatsune Miku primarily) and SAM (Software Automatic Mouth) to sing them.