I first thought "Elite Sinus Producer" and "The Sinus Creator" were trackers specifically designed for creating nasal-sounding music; but of course the explanation for why the term "sinus" came to be used instead of "sine" is likely because many demosceners were from a native European background, and their language retained the Latin origin word instead of deprecating its usage in favour of "sine", as happened in English.

Can confirm it's sinus in Norwegian, Swedish, Danish, Dutch, French.