Don, I agree that Ketron has definitely been the most 'end user' (arranger keyboard player) interested arranger keyboard company out there. Mr Sandro Fontenella (Ketron) 'immediately' understood my reasoning & real world need for arranger chord recognition of what are 'commonly played' worldwide accepted & played (by the keyboard pros) 'rootless' chord voicings, and knowing the value of this, seized the opportunity to expand the SD1 market to include pro jazz players worldwide as well. Even though I didn't purchase the SD1 myself, I believe both Ketron and the arranger keyboard community have benefited from this. I only wish Korg & Roland would join in and incorporate pro chords as Yamaha, Technics, and Ketron already do - Scott