The author analyses the evolution of technologies since the 1950s in Quebec's electroacoustic studios in five parts:
- 1950s, the device diversion: the tape recorder. The first Canadian studio is open in 1959 at Toronto - 1960s, new electroacoustic instruments: the synthesizers - 1970s, the liberation of means of production: new studios opening and the role of electroacoustic music in traditional music institutions - 1980s, the black hole: MIDI and digital synthesizers - 1990s, the Swiss knife: digital sound and the home studio
In each part, he describes several musical works that are representative of the period. The development of the home studio creates a new musical culture and redefines the role of institutional studios in Normandeau's view.