Its just one of the many high synths there are. One my triton, there are like 50 lead synths that are similiar, plus tonz of other instruments that, like bass,that if played in a high octave sound like that.
Those high synth lines were mostly west coast ( "Nuthin but a g thang"), but other people jumped on it, too ("Ill Al Scratch "Come around my way").
The EXACT synth??? I dunno.