yeah i think it's sine with some distortion (on the cleaner side), glide between notes, heavy sidechain to the kick. experiment with light EQing before or after the distortion effect (don't overdo that bit).
...the most basic soundwave, often used to play very clean notes (think of the sound a TV plays when displaying the color bars on an inactive channel). Visualized, it's a smooth curvy line, like this: ~