 Anthony Harrison-Griffin, an independent product designer was responsible for the design and build of the Gnat, drawing on the basic design and colour scheme of the already well established Wasp.The Caterpillar was a 3-octave master keyboard which could control up to four Wasps or Gnats using EDP's proprietary digital control system.It was released in 1980, after Huggett had left the company, though he contributed to the design as a freelancer.