You have to turn MEMORY PROTECT = OFF Page 19 will show you how to load a group of Voices, followed by how to load a single Voice from ROM to RAM ...

Sorry to hear that. What do you mean by “how to change the voices”... there are 128 Voices. They are listed in the manual on page 8 I’m confused o...

Highly recommended: Yamaha DX21 Owner’s Manual I have looked at the manual and it hasn’t really helped me on what I want to figure out.