The mixing or blending of two or more audio signals to generate a new signal, which is often used for audio dubbing. Audio mixing requires that all audio channels involved are amplified and equalized to the same level. To mix a line level input with a microphone signal, the microphone signal must be pre-amplified to bring it up to a level similar to that of the line signal. In video processing, audio mixing is used for the insertion of background music behind the dialogue. It is also employed in the creation of cross fading between two audio sources. It produces a drift in the level of the received signals until one fades out and the second becomes dominant.
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