PIPER was one of the earliest hybrid performance system allowing composers and musicians to write and edit music in real time using computers and analogue synthesisers. The system was developed by James Gabura & Gustav Ciamaga Who also collaborated with Hugh Le Caine on the ‘Sonde’) at the University of Toronto (UTEMS) in 1965. With computing technology in 1965 being to weak to synthesise and control sounds in real-time a work-around was to leave the scoring and parameter control to the computer and the audio generation to an external analogue synthesiser. The PIPER system consisted two Moog oscillators and a custom built amplitude regulator to generate the sound and an IBM 6120 to store parameter input and to score the music. The computer would read and store the musicians input; keyboard notes, filter changes, note duration and so-on and allow the user to play this back and edit in real-time.
By the 1980′s such large hybrid analogue-digital performance systems like PIPER and Max Mathew’s GROOVE were obsolete due to the advent of affordable, microcomputers and analogue/digital sequencer technology.