Hi Denis,
Congrats to your new Pro.

I had the same problems with some converted Styles.
The fault occurs during style conversion.
There is nothing wrong with your Pro.

I don't have a solution for you. Maybe someone else will.
Regarding the accomp. part, only in the newer models will you find the dynamic feature. Sorry.
I will try to send you some CVP-209 Styles, so you don't have to worry about your Roland Styles.

You just have to adjust the volume of each instrument to your liking.
Enjoy

Eric