saw a guitar at radio shack, had a built in sd card reader.....sales person couldn't show or tell me how it operated. can any of you folks tell me anything about this reader?? i'm interested in something i can use while accompaning my home stereo...CDs and tapes....either stereo or guitar sounds great alone..mix them and blah, two different sounds. could this card reader sound compatable with guitar playing through my amp?? any help would be appreciated. by the the way, i'm PC dumb and really old......looking for a better way...thanks slowpicking