Thanks Stephen
Hopefully might help some others too .
Can't beleive it took me till now to try this function.
A lot of us probably do use the odd non factory style and it's usually the drums that let one down. Poorly balanced because they were recorded for a different keyboard.

Sounds for the accomp. parts can be changed easy enough provided the instruments are the same throughout the style ie vari 1 , acc 1 piano as long as var3 acc1 isn't all of a sudden a flute, Gives one the opportunity to try different versions of the instrument for the style without having to go into edit mode and physically change them.
Just choose any replacement instruments, adjust volumes , and write to current style settings.

Going thru my user styles at the moment and making sure where possible my instruments are uniform throughout the style.
Taking a bit of time, but should be worth it in the end.
Pity again, I didn't think to do that when I was converting them in the first place.

Live and learn. Haha