Short answers, pulled from the story.
King Tubby, born Osbourne Ruddock, was a Jamaican sound engineer who lived from 1941 to 1989. He opened an electrical repair shop on Drumalie Avenue in Kingston during the late 1950s before becoming a pioneer of dub music.
King Tubby began working as a disc cutter for producer Duke Reid in 1968 and decided to open his own studio in Waterhouse later that year. This transition marked the beginning of dub music as a distinct genre by 1971 when his sound system consolidated its position as one of the most popular in Kingston.
King Tubby re-taped or dubbed original multitrack master tapes through a twelve-channel custom-built MCI mixing desk to twist songs into unexpected configurations. He used creative manipulation of the built-in high-pass filter known as the big knob to introduce dramatic narrowing sweeps until signals disappeared into thin squeals.
Several albums of King Tubby's dub mixes were released among the earliest being Blackboard Jungle from 1974 and Bunny Lee's Dub from the Roots also arrived that same year. His most famous dub was King Tubby Meets Rockers Uptown from 1974 which featured Bob Marley's drummer Carlton Barrett playing a traditional one drop rhythm.
King Tubby engineered and remixed songs for Jamaica's top producers including Lee Perry and Bunny Lee featuring artists such as Johnny Clarke, Cornell Campbell, and Horace Andy. Augustus Pablo played melodica on the final version of King Tubby Meets Rockers Uptown which later appeared on Pablo's 1976 album.