You have a couple of optio

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Avatarbirdcat
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You have a couple of options – 1) you can record a small amount of “silence” and then remove that from the whole using a noise reduction filter (Audacity has this and is free but so do many commercial sound editing packages like Sound Forge, Audition, etc…) or 2) add a filter to remove the specific frequency of the hum (Vegas has this as do many others).

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