I also encountered the problem with Creative Meadia Source not recognizing my Yamaha F1. How frustrating!
However, I did discover a few updates for the Audigy 2, at least one of which addresses the issue with the Yamaha F1. I think another fixes some bug with the EAX console or something. Those updates can be found on Creative's Support page. Or you can try this link: http://www.americas.creative.com/support/files/download.asp?Centric=279&OS=13
BUT - I have yet to sucessfully burn anything with Media Source. Even though the recorder is detected correctly with Media Source, the software's burning engine fails due to buffer underrun. Can you believe that?!
Any advice or feedback is welcome.