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Knowledge Base > Discontinued Products > 421m AGC-Leveler

Why doesn't the 421m AGC-Leveler or 422 Stereo AGC-Leveler work when I test them on my bench with a sine wave or pink noise?

The units will not attempt leveling action on a sine wave or pink noise because they do not recognize a sine wave or pink noise as true audio. To test the units, you must use a real-world audio source, such as music or speech.

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