Casio CZ/ VZ/ FZ - Pro Series

I have both a CZ-1 and a JX-8P+PG800
The Roland is well built, it is easy to program and makes interesting
sounds, but I like the Casio even better.
The thing I don't like about the Casio is the programming interface.
The direct key for every setting is a good approach but the page
up/down cursor left/right system forces me to keep looking at the LCD
screen and spoils my mood. The value up/down keys are also not practical.

A small change to the CZ1 firmware could improve this:

- the modulation wheel could be used for parameter input

- the 8 black panel keys could be relabeled and used for direct
parameter selection,
  no more page up/down cursor left/right value+/- sus/end keys
  a first 1-8 key press to select parameters 1a-8a
  [a second 1-8 key press to select parameters 1b-8b]
  [a third 1-8 key press to select parameters 1c-8c]

example:

Changing DCW1 envelope curves:
1. press the DCW1ENV key

2. press panel key 1 for rate1; roll the wheel
3. press panel key 1 for level1; roll the wheel
[4. press panel key 1 for ***/sus/end1; roll the wheel]

5. press panel key N for rateN; roll the wheel
6. press panel key N for levelN; roll the wheel
[7. press panel key N for ***/sus/endN; roll the wheel]

This would allow me to play with sounds without even looking at the
screen.


I've been an assembly language programmer for many years and this
small change to the CZ-1 firmware is within my capabilities.
Does anyone know of disassembler/assembler tools for the NEC 87AD
series microcontrollers? Is a dump of the CZ1 ROM available?

Best regards,
Joaquim Carvalho