Hello! I am using a Pioneer Minidisc Recorder MJ-D508 and it is unable to play my minidisc back to me. I know there is audio on my mini discs because i can listen back to it on headphones but when i put it in the recorder and press play it just says no audio. It's the first time I have used this piece so am a novice to it and need some help, i know there is audio there but why can't the recorder see it? Help!