Lee DeForest invents the Triode Vacuum Tube which led to amplification of electrical signals.
1906
1930's Improvement of amplifiers and invention of the Tape Recorder. John Cage composes Imaginary Landscape no.1 (1939) and no. 2 (1942) using test-tones from recordings, which were played on variable-speed turntables.
Telharmonium invented
1887
1948 RTF This marks the beginning of studio realizations and musique concrete.
1952 Four compositions for tape recorder
Raymond Scott designs possibly first sequencer which consisted of hundreds of switches controlling stepping relays, timing solenoids, tone circuits and 16 individual oscillators.
1958 Varese Poeme Electronique played over 400 loudspeakers at the Phillips Pavillion of the 1958 Brussels World Fair.
1959 Columbia-Princeton Studio established in New York with the help of a $175,000 Rockefeller grant. Incorporated the RCA Mark II synthesizer, the first major voltage-controlled synthesizer
1967 Max Mathews and F. Richard Moore develop GROOVE, a real-time digital control system for analog synthesis, used extensively by composers Laurie Spieglel and Emmanuel Ghent in the 1970's.
•1970's Mini-Moog, a small affordable integrated synthesizer make analog synthesis easily available and affordable, along with newcomers ARP and Oberheim