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A portable digital recorder is a compact, battery-powered device that’s capable of creating high-resolution digital audio recordings. Most portable digital recorders feature built-in microphones, but some only have inputs for connecting external audio signals.

With all of the advantages that the HDSLR revolution has given video producers and filmmakers, there are a number of well-known drawbacks to be aware of: moiré, aliasing, lack of headphone monitoring and sensors that quickly overheat. One of the lesser-known drawbacks is an audio feature called AGC.

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