Many thanks. Sometimes it is more simple than expected.
I'd like to try the 6.1 ports, but i am using a screenreading software to access the phone, because i am blind. Afaik this software is not yet compatible with 6.1. So i'm afraid i have to wait for an update.
I still can't play midi files with the WM6 V2 ROM. Windows media comes up with an error "source filter could not be found". Is there a solution?