The ‘Fonosynth’. Paul Ketoff (Paolo Ketoff), Julian Strini & Gino Marinuzzi jr, Italy. 1958.

The Fonosynth at the Musical Instrument Museum (photo:
The ‘Fonosynth’ now at the Musical Instrument Museum, Munich, Germany. (photo:

The Fonosynth was a large analogue valve and transistor based studio synthesiser designed and built by the Polish-Italian sound engineer Paul Ketoff (with musical input from the Italian composer Gino Marinuzzi jr) and was created specifically for the new electronic music studio at the American Academy in Rome.

This studio had been founded by the American composer and co-founder of the Columbia-Princeton Electronic Music Center  (CPEMC in 1959 – the first studio for electronic music in the USA and home to the  RCA Synthesiser) Otto Luening (June 15, 1900 Milwaukee, Wisconsin USA – September 2, 1996 New York City, NY, USA) – who was at that time Composer in Residence on a one year secondment from Columbia Princeton at the American Academy:

“During his first residency in the Spring and Summer of 1958, Luening tapped Columbia’s Alice M. Ditson fund to purchase a library of contemporary music recordings for the composers’ use. Then, when he returned for a 6 week summer visit in 1961, he converted the composers’ “listening room” (located in the basement of the Academy) into a rudimentary “electronic music studio”. This studio eventually contained three sine wave oscillators, a spring reverberation unit, a microphone, an Ampex stereo portable tape recorder and a mixing console. Added to the listening room’s professional 350 Series Ampex mono tape recorder and a radio/record player, this equipment became a laboratory for sound research. In 1964-65 when Luening returned for a second, year long stay as Composer-in-Residence, the Ditson fund ( Columbia University’s Alice M. Ditson Fund) covered the purchase of one of the first portable electronic music synthesizers in existence, the Synket (nb; the ‘Synket’ here is probably confused with the Fonosynth), invented and constructed by Paul Ketoff – a brilliant Roman audio engineer involved with Rome’s Cinecittà. It was Ketoff, in fact, who had designed the original studio room and mixing 8 console and whose guidance and unflagging enthusiasm had been a key element in making the fledgling studio operable. With the Synket installed, the listening room became a fairly advanced electronic studio for the time and it served as such for many of the Fellows. The studio was also used by a number of visiting American (Larry Austin, Alvin Curran, etc.) and Italian (Aldo Clementi, Mauro Bortolotti) composers.”

Richard Trythall ‘A History of the Rome Prize in Music Composition’

There were numerous American Avant-Garde composers and musicians passing through Rome at this time (1950-60s) usually on some kind of study grant. This was in-part because of a postwar initiative set up by the US government to promote American culture and regenerate the cultural life of Rome:

 “an international showcase idea which went along with lots of neon signs and skyscrapers – to shout down communism”

(Alvin Curran. Soundings No. 10, Soundings Press, Santa Fe, 1976).

Artists involved with the American Academy, Rome included  flutist Fritz Kraber, clarinettist Jerry Kirkbride, sopranos Joan Logue and Carol Plantamura, violist Joan Kalisch, pianists Joe Rollino and Paul Sheftel and composers such as William O. Smith, John Eaton, Richard Trythall, John Heineman, Alvin Curran, Frederick Rzewski, Richard Teitelbaum, Allen Bryant, Jeffrey Levine, Joel Chadabe, Jerome Rosen and Larry Moss, Larry Austin.

Detail of the Fonosynth
Detail of the Fonosynth

The Fonosynth was completed in 1958 and was used throughout the late fifties and mid sixties by a number of expat American electronic musicians and composers (including Otto Luening, William O. Smith, and George Balch Wilson, Richard Trythall, Alvin Curran amongst others) as well as for film soundtrack sound effects for the Italian film industry. The Fonosynth now resides at the at the Museum of Musical Instruments in Munich, Germany.

The Fonosynth’s sound was generated by twelve sine wave oscillators and six square wave oscillators (each matched with individual band-pass filters). This audio signal could be modulated and coloured using audio filters (2 octave filters, 2 selective resonant filters, 1 self oscillating filter, 1 threshold filter) two LFOs, an impulse generator and white noise generator, two ring modulators and a wave shape generator to determine the ADSR of each sound. The resulting output was fed into an 18 channel mixing console and amplified to a stereo or mono audio output.

The whole instrument was controlled by an unusual  keyboard made up of 6 rows of 24 keys allowing for Enharmonic, microtonal performance and composition.

Soon after, Ketoff built a successor to the Fonosynth in 1963 called the Syn-ket (Synthesiser – Ketoff) which was designed as a portable performance instrument – with musical input from John Eaton (and others).

Paul Ketoff
Paul Ketoff (at the Syn-ket) c 1963

Biographical Notes Paul Ketoff/Paolo Ketoff.

Polish-Italian Electronic and sound engineer. Born 1921 died 1996. Ketoff became the chief sound technician at RCA Italiana/Cinecittà film studios, Roma, in 1964 and the Fonolux post production company, between 1957 and 1965. Ketoff designed many devices for film music production including dynamic sound compressors and ring modulators, reverb chambers and plates, and established a new standard of sound post-production.

Film credits for sound production and effects from this period include (1966) ‘Africa Adido” , (1966) ‘La Traviata’ (1965) ‘Terrore Nello Spazio’, (1960) ‘L’ avventura’ (1953) ‘Pane, amore e fantasia’ (1965) ‘Planet of the Vampires’, (1959) ‘Hercules Unchained’

Commisioned to design and build the Electronic Music Studio at the American Academy in Rome, Ketoff finished his first synthesiser, the ‘Fonosynth’ in 1958 and then designed a much more compact voltage controlled performance ins trument called the Syn-ket in 1963 which was presented at the conference of the Audio Engineering Society (AES) in 1964,

Ketoff was a lifelong friend and collaborator with the Italian composer Gino Marinuzzi jr. Paolo Ketoff was married to Landa Ketoff, the well known musical critic for La Repubblica Newspaper.

Gino Marinuzzi Jr
Gino Marinuzzi Jr

Biographical Notes Gino Marinuzzi Jr.

Born 07/04/1920 – New York (U.S.A.), Died: (age 76) in Rome, Lazio, Italy

Gino Marinuzzi jr. was the Son of the conductor Gino Marinuzzi and was born in 1920 in New York, USA,  while  his father was touring in the United States. He studied piano and composition at the Milan Conservatory. Before graduating in composition, piano and conducting. Marinuzzi jr wrote his first early work: Concertino (piano chamber orchestra) and various compositions for piano at the age of sixteen.

Marinuzzi became the assistant conductor at the Teatro dell’Opera in Rome from 1946 to 1951. He made his debut as a conductor in Spain in 1947, during a tour of the Ballet of the Roman theatre; then chooses to devote himself exclusively to composition. Marinuzzi  made the numerous film soundtracks during this period and was very active in the field of electronic music. In 1956 he founded the ‘Studio of phonology  for the Roman Philharmonic Academy’ and later was a founding member of the experimental study group R7 with Paolo Ketoff, Walter Flocks, Franco Evangelisti, Domenico Guaccero, Guido Guiducci and Egisto Macchi.

Marinuzzi spent two years – 1943 to 1945 – in a Nazi concentration camp, (prisoner 50914 Stalag XII F) an experience from which he created the ‘Lager lieder’, in which he elaborated on popular Russian, Ukrainian and Gypsy themes learned from his fellow prisoners.

In 1956 the composer opened the first laboratory of electronic music in Rome at the ‘Accademia Filarmonica Romana’ and constructed one of the first modular synthesiser for the production of electronic music called the ‘Fonosynth’. The device, made by the engineer Julian Strini and the sound engineer Paolo Ketoff in collaboration with Marinuzzi was completed in 1958,

In the 1960s and 70s Marinuzzi devoted himself mainly to film scores, theatre, radio and television, and only resumed composing for orchestra in the 1980s. He was particularly involved  and played a pioneering role in research and musical experimentation in the field of electronic music since the 1950s.

He is the father of the singer and guitarist Joan Marinuzzi.

Marinuzzi’s film works include:  ‘Romanzo d’amore’ (1950),  Jean Renoir’s ‘Le Carrosse d’or’ (1952) and Vittorio Cottafavi’s Ercole alla conquista di Atlantide (1961). ‘I castrati’ (1964),Mario Bava ‘s ‘Terrore nello spazio’ (aka Planet of the Vampires, (1965), ‘ Matchless’ (1967). ‘La piovra’ (1984)  (aka The Octopus).




Exhibition of the ‘RAI Studio Of Phonology’, Milan, Italy

‘Music and Musical Composition at the American Academy in Rome’ edited by Martin Brody

A History of the Rome Prize in Music Composition * 1947 – 2006 * Richard Trythall Music Liaison American Academy in Rome January 1, 2007

‘Gino Marinuzzi Jr: Electronics and Early Multimedia Mentality in Italy’. Maurizio Corbella, Università degli Studi di Milano

L. Pizzaleo, Il liutaio elettronico: Paolo Ketoff e l’invenzione del Synket, Aracne Editrice, Roma 2014 (Immota harmonia, 20), pp. 31-38.

P. Ketoff, Synket, generatore elettronico di suoni sintetici

Paolo Ketoff e l’invenzione del Synket, Aracne Editrice, Roma 2014 (Immota harmonia, 20), pp. 31-38.

3 thoughts on “The ‘Fonosynth’. Paul Ketoff (Paolo Ketoff), Julian Strini & Gino Marinuzzi jr, Italy. 1958.”

  1. Interesting music pieces & history! Fortunately, I was a student @ Conservatorium of Music, Auckland University in the mid – late seventies, so was able to appreciate a wide range of musical styles, thanks to one of our foremost composers, Dr John Rimmer. Thanks to him, my ears were gently opened to various (relatively) new sounds. This has been a great help towards my enjoyment of a very wide range of music indeed!

  2. Un articolo che fa molta confusione su tante cose sulle quali Gino Marinuzzi jr ha avuto un ruolo ben più importante di quello attribuitogli nella prima parte dell’articolo e attribuisce a Paolo Ketoff molte cose realizzate da mio padre. La storia corretta è quella nella seconda parte dell’articolo.

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