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These dual cassette decks were throw away units in most cases. The belt inside and the grease in the cam mechanism is in bad shape and the deck can not cycle through the steps it need to so as to reach stop. Only stop mode will allow the door block to release. The tape can safely be extracted by a Technician. The deck need work. Dual cassette decks are not always worn the repair cost.
Changers are notorious items to have failure- that is why most Technicians have high end single well decks. There is no secret way to fix changers. You need to get the service manual to know where and how the parts go into the unit and then get into the transport of the unit to restore that parts into position. In my experience with plastic part changers, they do not stay in the correct shape and parts work out of reference which result in jam ups and further problems down the way. Most of my work was done in CD changers but I did a few cassette changers and they are all disasters designs.
Anything that eats tapes means the take-up torque is low of stopping due to bad belts or a bad Idler system or even cracked tires. The transport have to be taken out and those parts replaced and then it will work again.
If you record a track with NR (standing for Noise Reduction) on it will sound brighter than with it off. The B and C sounds like it's Dolby B and Dolby C type noise reduction. C is better than B, but it's up to you to decide which you like best. Both systems were developed to deal with the problem of tape hiss. Most commercial tapes use Dolby B. If you record with either Dolby on it is best to play it back with it on, as it can make the tape sound more hissy, switched off. But if you don't record with it on, then putting Dolby on to playback would make it sound dull.