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Roberto del Rosario, a prolific Filipino inventor, independently created a music system with accompaniment and a pre-recorded vocals that could be turned up or down on a separate track.
Del Rosario became famous in 1972 for his OMB ( One Man Band ) which could play the entire orchestra to the tune of cha-cha, boogie, and others.
In 1974, del Rosario invented the Sing Along System ( SAS ) composed of a microphone, amplifier and system that had the innovation of adding effects to the user's voice such as reverb.
The machine became known popularly in the Philippines as Minus-One ( named after the subtracted vocal channel when turned down ).
del Rosario's version is described as:
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