2, nowadays, the tape recorder, including the function has, can play the CD, can play the tape, also can listen to the radio.
3, Usually there is an adjustment switch on the tape recorder, toggle it, you can set which device to play the content in. If the switch is flipped to the RADIO end that plays the radio; if it is flipped to the TAPE that plays the tape; if it is flipped to the DVD, that plays the CD.