the NR button switches the dolby noise reduction on or off. leave it on. the edit button allows you to spool the tape out, if you wanna edit (cut) it. i have a manual but its not in my possesion at the moment, its with my a8 which someone else as borrowed for a while. i'd be happy to answer any questions you might have, but really its a pretty simple machine and you should be able to work it all out just by playing with it for a while.