what does it mean if your cassette deck playback and recording sounds warbly?


what does it mean if your cassette deck playback and recording sounds warbly? I just got a brand new Tascam CD-A580, and my recordings and playback sounds shaky or warbly. 
leemurray2007
I hope it dont have to send it back; it looks great, and plays cds as well. but, i dont want a defective deck.
@russ69 ok man. stop trolling my threads with negative comments. You are being a jerk
Troll?
How does telling truth equate to that?
If you don't want to hear that the deck is more likely to be the problem than the tapes are, just get used to it.
Instead of juvenile name-calling.
Abrupt language is NOT negative.
Why did you buy a new deck anyway?
Hopefully to insure against manufacturing defects. Too high a price to pay for me.