I missed out on the Casio CZ-1...Ray gave it to his son. Drat!
Hi Ian,
Are there specific sounds on the CZ-1 you wish you had in the Tyros 4?
Perhaps these CZ-1 sounds may already be available as VST/Wav samples,
and you could then simply convert them to UVN custom voice format,
and then load and play them on your Tyros 4.
The T4 optional 'expansion memory module' would be required for this,
but well worth the investment to gain the ability to import new sounds to Tyros 4.