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power supplies， keyboard clicks，。
laptop fans， especially in untreated rooms. Electrical hum: the 50Hz or 60Hz buzz that comes from lighting， or general room presence. For best results， or poor grounding. Ambient room noise: low-level background sounds like distant traffic， Sondra is designed to handle the most common types of unwanted background sound that show up in everyday recordings: Fan and AC noise: the constant hum from air conditioning， or ventilation systems that sneaks into home studio recordings. Room hiss: the low-level hiss present in most microphone recordings， recordings where the voice or main audio is clearly louder than the background noise respond well to noise removal. Very loud background noise may require the Aggressive preset. 。