In 1979 , he took the prototype to the NAMM trade show in Atlanta .
Mattson relocated to Bend , Oregon , and moved in with his mother and step - father , where he hand - built the Syntar prototype from EML circuit modules .
In 1979 , Mattson took the prototype to the NAMM trade show in Atlanta .
Mattson relocated to Bend , Oregon , and moved in with his mother and step - father , where he hand - built the Syntar prototype from EML circuit modules .