LEFF.DEFF is half-English, half-Dutch and half-deaf. He primarily mixes English bass music with Dutch electro. Or at least, he tries to do so. After all, he is half-deaf.

Unlike his hearing, his sets aren't limited at all. Using unpredictable breaks and bass-heavy tracks, he likes to switch between dubstep, electro and alternative rock. His selection is audibly influenced by the cities where he feels at home, such as Breda, Rotterdam, the Hague and London.