The lead sound was origanily played on a Oberheim 8-Voice (Oberheim SEM) in the studio and live, as was the Rez sound at the start of the song.
The Rez sound was later used by Oberheim in the factory pre-sets of the OB-X, OB-Sx, OB-Xa & the OB-8 and wass called 'Rush Rezz'.