Multi-channel recording uses multiple directional microphones to pick up the musical tones of a single instrument or a group of instruments to form a multi-channel mono signal, then combine the picked-up sounds through a mixer, and finally synthesize a two-channel stereo sound program. The number of channels produced by the early multi-channel programs includes 2 channels, 4 channels, 8 channels, and 16 channels. In recent years, 24 channels up to 32 channels of digital recording equipment have been commonly used. The outstanding advantages of multi-channel programming are the high definition of the program, the ease with which various sound ratios can be adjusted, and the balance of the voice is easy to control and can be supplemented. Another advantage is that post-production is easy and there is plenty of room for adjustment and processing. In addition, it also has a variety of advantages. For example, it is possible to synthesize a mono program or a stereo program, and to synthesize a solo, solo, or accompaniment program, by reproducing a multi-track tape that has already recorded a sound.
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