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Whether it is a live performance and you are at the mixer, a radio broadcast, or you're the DJ at an event or nightclub, you will most likely be involved in audio processing in real time. Once performed by electronic equipment such as mixers, equalizers, and filters, the new age of digital audio processing via computer has revolutionized these industries. This is a very expansive subject to which this article will try to break down three popular but very different applications. As an example, the goals of a radio broadcast technician, the guy running the sound board at a live concert, and the DJ at a simple mixer are not necessarily the same. In some instances they may be very opposite. However, all instances will involve some type of audio processing and the application either by means of a physical device such as a mixer and equalizer, or by digital processing being done via a computer will be used. In some instances hardware and software are combined.