IT IS HIGHLY RECOMMENDED THAT YOU FAST FORWARD, THEN REVERSE ALL USED AUDIO CASSETTES THAT YOU PURCHASE FROM ANY VENDOR BEFORE ATTEMPTING TO PLAY ON YOUR SYSTEM. THIS WILL TIGHTEN UP THE TAPES AND PREVENT ANY LOOSE LOOPS IN THE TAPES AND HAVING  YOUR MACHINE GRAB THE TAPE AND SHRED IT ON THE MACHINE....I LEARNED THE HARD WAY JUST SAYING..