??????He claimed to have 1st considered the idea of a karaoke-type equipment when he was asked by a outstanding client to Engage in for him on an right away vacation to an onsen. Not being able to do this, he in its place offered a tape of his accompaniment into the client. Acknowledging its probable, he considered merging these pre-taped accompani

??????Del Rosario was himself a pianist and was a member of the newbie jazz team Executive Combo Band (composed primarily of politicians and distinguished businessmen). He owned an organization, Trebel Industries, that was the main maker of pianos and harpsichords while in the Philippines. Del Rosario also invented and patented other audio tools pr