Hello mdorantes,

Thanks for your comments. I would like to tell you a couple things:
1) Yamaha TG33 is one of the best synthesizers I ever had. My TG33 is 27 years old. I love it. I have investigated sysx codes and advanced programming via MIDI. It is a great instrument.
2) I've found a bug on the PSR-S970 which has not been fixed on software updates. How can I report it?

Best regards,
Guillermo.