 Earlier experiments using this re-dubbing technique, carried out by Victor in 1927, had been considered unsatisfactory.In 1950, RCA Victor reissued a number of Caruso recordings on 78-rpm discs pressed on red vinylite instead of the usual shellac.As long-playing discs (LPs) became popular, many of his recordings were electronically enhanced with reverb and similar effects to make them sound "fuller" for release on the extended format.