 Beginning in the early 2000s, Yamaha have re-entered the market with simple midi guitars (EZ-AG and EZ-EG) these have illuminated frets to teach finger technique and 20 voices.Starr Labs' Ztar is one of the few remaining guitar-like controller product lines still in production.A Ztar differs significantly from the SynthAxe and Yamaha G-10 in that the "fretboard" is covered with keys, not strings.