For MIDI-controlled instruments, you are thankfully not constrained by the original user interface; someone else can make a better one without needing the help

For MIDI-controlled instruments, you are thankfully not constrained by the original user interface; someone else can make a better one without needing the help or permission of the manufacturer. Yamaha, to their credit, provide comprehensive, detailed information on the MIDI implementations of their products even today, a time where this has become unfashionable.