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The SynthAxe is a fretted, guitar-like MIDI controller, created by Bill Aitken, Mike Dixon, and Tony Sedivy and manufactured in England in the middle to late 1980s. It is a musical instrument that uses electronic synthesizers to produce sound and is controlled through the use of an arm resembling the neck of a guitar in form and in use. Its name comes from the words synthesizer and axe, a slang term meaning guitar.
The SynthAxe itself has no internal sound source; it is purely a controller and needs synthesizers to produce sound. The neck of the instrument is angled upwards from the body, and there are two independent sets of strings.
The fretboard is continuously scanned and sends signals to synthesizers which produce the sound. The left set determine the pitch played, through contact with the frets on the neck and by sensing the side-to-side bending of the string. The right set of strings are velocity sensitive; these strings can be plucked, strummed or damped in the same manner as a guitar's. A keyboard made up of nine keys can also be used to trigger notes instead of the strings.
When originally produced, the SynthAxe was priced at £10,000 (approximately $13,000) and eventually sold for about $8,000.00. It was such a sophisticated and expensive piece of machinery that few were sold making it difficult to keep the company afloat. Eventually Virgin Games took over the distribution but let it go after a couple of years.
The SynthAxe is no longer produced and it's very difficult to locate used units (fewer than 100 were made). Most musicians who desire a MIDI guitar controller often use other alternatives, such as Roland or Axon systems that can convert a guitar's output to MIDI via 13-pin cables and outboard devices or older systems such as the Roland GR-300.
Design of the key toggles was done by the late David Fowler, at the time trading under BJ Hopkins Injection and toolmaking, in Littleworth, Oxford.