The Arp Electronic Music Synthesizer. Duotone 6 page booklet illustrated with photographs, testimonials, prices. Back cover indicates Paul Bley sold them through his company, Synthesizers, Inc. in NYC. Main features represented in this booklet are "Matrix Switches" and "Stable Oscillators". Some of the testimonial respondents include: Harold Shapero of Brandeis University, Milton Babbit of Princeton University, J.K. Adams, Gerald Shapiro of Brown University, Paul Conly of "Lothar and the Hand People", Edith Oliver of The New Yorker, Richard Watts of the New York Post, Lee Silver of the Daily News.