I haven't read this whole thread, but I found this thing
http://www.nyko.com/nyko/products/?i=44
which I had to buy - it cost about $20. The sound is OK. I'm not sure how it's doing what it's doing. seems to answer your question though
http://www.nyko.com/nyko/products/?i=44
which I had to buy - it cost about $20. The sound is OK. I'm not sure how it's doing what it's doing. seems to answer your question though