the only reson i'm making a big thing about this is because in the book"blues harp" a good book in the position chapter it says"in 3rd position f natural is not posible unlesas the guitar uses a capo. and in 4th position in the keys g,f, and c the same goes for that. can't do it unless guitar has a capo. it dosn't make any sence to me. tommy lee in ct.