What you want to do does not appear all that simple to me. Making styles from scratch is never a trivial task, and the .wav file is not just a different file format from midi, it is a completely different animal because .wav files are audio files, and midi files are not. Midi files only contain digital instructions for a midi instrument. So first you have to create a midi from the .wav. There are commercially available converters which take an audio file and create a midi but I don't know how good they actually are. And even after you have the midi file, you are probably still a long way from having style parts that can just become a style. If you think about it, yes, the style parts are essentially little midi loops, but they are quite special midi loops, because to make the style usable requires that each part is designed so that it works no matter what chord is played, and when it is changed. There are software tools which try to make styles from midis, and there have been mixed reports by people who have tried to use them ranging from 'it doesn't really work' to ' it kinda works but be prepared to edit the kazoo out of the style to make it usable' and ' it would have been easier to start from nothing and create the style'.
If people have styles you like already for the 970 then I don't see why you cant just use them on the 950, with maybe a little editing. This would certainly be way easier and probably more successful than starting with an audio file.
Mike