The Oncor The Touch bass guitar synthesizer was a self contained instrument which could be played through any amplifier. It had no strings to replace or tune. Instead the Oncor synth used sensitive fret switches to select notes, while the sounds were actived by four spring loaded strum bars. It had various synthesized features including fret memory and an instantaneous three octave change.These bass synths were made in the USA from around 1979 to 1980.