From a hardware perspective, Line in is an input terminal (jack) for receiving line level signals. From a functional point of view, Line in is an MP3 direct recording function. It can directly capture audio sources from external audio devices such as CD players, VCDs, and recorders through audio cables, and then compress them into MP3 format audio files using the MP3 encoding function inside the machine. In this way, you can record CDs and other audio sources into MP3 music without going through a computer.
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