How does an old tape recorder eliminate the original sound on the tape? Which key to press to record?

The old tape recorder has no special degaussing key. As long as you press record, you will automatically erase the original sound, record a new sound, or understand that the new sound will overwrite the old sound. \x0d\ The RECording key is red and marked with English rec and PLAY keys. Most old tape recorders need to press these two keys at the same time to record. \x0d\ There are also tape RECorders that can only record by pressing rec. This kind of tape recorder is very dangerous. Once it is pressed by mistake, it will erase the original sound and cannot be recovered. \x0d\ The landlord can try it. Just press REC tape. If you don't take the tape, press REC to play it at the same time.