While most commonly known for his pioneering work in electroacoustic music, his early career was that of a hot-jazz violinist in the London dance bands in the Roaring ’20s, including Ray Starita's Piccadilly Revels.
In the years before his death, he devoted considerable effort to exploring new ways in which to use electro-acoustic music in the building of special sound environments.
In 1931 Siday purchased a Frazer Nash Sports Ulster fitted with a supercharged 1.5 litre Meadows Engine, with registration HX3535 which the car still holds today.
He was subsequently invited to join the AFN works team for the 1932 German Grand Prix automobile d'Allemagne held at the Nürburgring Nordschleife circuit on 17 July 1932.
His archives, which included business records, personal papers, music scores, photographs, and tapes, were donated to the New York Public Library.