Yamaha DX7

Quote from the Yamaha DX7 operating manual

"...the Yamaha DX7 Digital Programmable Algorithm Synthesizer employs unique and sophisticated FM digital tone generation technology combined with microcomputer control to permit creation of voices that are more "live" than voices available with any other system available."

Larry's keyboard solo in the title track "The Prisoner" was performed using the Yamaha DX7.