Ian,
there is a lady on Steve Selwood's forum in the UK who is extremely adept with the Tyros keyboards. She posted today her Tyros 4 registrations are picking up the Tyros 4 voices in the legacy folder and play just great but will have to be revoiced to use the Tyros 5 voices. Rather interesting I think.
Deane
Why do they have to be revoiced to T5 if they play great with the T4 legacy sounds?
The only things i can think of as a non tyros player are either loading times when selecting a style with legacy sounds..
or
Sounds that where non standard and with edits in the T4 styles not laodign with those edits but just as the standard sounds..