In realistic terms, an arranger keyboard, synth and loads of other electronic musical instruments are nothing more than small computers with piano keys or strings. They were all programmed initially, and if we knew or were smart enough to know exactly how they were programmed we could do our own upgrades using the PC. Unfortunately, this information is locked securely in vaults of the various manufacturers. Best advice is to learn everything there is to know about the keyboard you own. You would be amazed at what's inside.

Gary