Yamaha CS80

Been listening to early 80's Vangelis. The album "See you later" has a 
song called "Not just some. All of it". The strings in it sound like an 
acoustic ensemble (cello and viola at least) but the credits mention 
Vangelis as playing all instruments. Are these strings CS80 or are they 
acoustic? If they are Yamaha, damn, that's pretty good imitative 
synthesis!