Arp Pro Soloist
The Arp Pro Soloist is a monophonic synthesizer used by Prince on For You and Prince. Prince played the solo on "Soft And Wet" on the Pro Soloist. It was also used live by Dr Fink  and Gayle Chapman.
By the time I joined him, my personal setup was just a Minimoog, a Rhodes, a Farfisa VIP 345 with a Leslie speaker cabinet, and a Freeman string synthesizer. At that same time, he had all this gear he bought with money from his record deal, so I integrated what I had with what he had. I got rid of the Freeman and went to an ARP String Ensemble, and the old Oberheim Four-Voices and S.E.M. modules. I kept the Minimoog, and added a [Hohner] Clavinet and an ARP Pro-Soloist... a lot of stuff! It was a Rick Wakeman kind of setup. Then, as time went on, I pared things down, and every year kept updating as things changed.