Hi Ive just transfered some tracks using net md in sonic on to some mds, they play in recorder but not in my car, the mini discs i got with my new car play ok in the car, ive tried new discs at all 3 speeds with no luck, i can see text & see they are playing, but zilch as far as sound goes??? Hope someone can help? thanks Ps car player is sony MDX C 5970