I recently acquired a Yamaha KX-W602 off of eBay. Playback sounds fine on a prerecorded cassette, but when I play some recordings I made for my new album on cassette, it sounds super muddy and horrible. I recorded the cassette on a kenwood machine that forced me to rerecord many times because of this stupid dip in volume that happened very frequently in a track, for very short periods of time (quarter of a second to three seconds). With the exception of Deck A not working properly, it sounded fine, and I had no problems other than the ones I just mentioned, thus I am confused on why my recordings sound so bad all of the sudden. I even compared the pitch of the cassette to a live version, and, as far as my ears can tell, it sounded pretty in tune. I really don't want to rerecord all of my tracks if I don't have to, so I need quick help.