Gale, I believe I have the same system and would like to replace / upgrade mine to a system with a cd. Although I would sell you mine, as it works fine; you might check to make certain one of your buttons may not be depressed or partially depressed on any of the room or door stations causing a "feedback" or "buzz". Just a thought. If you are interested in purchasing my unit, let me know. Thanks Jack / Omaha

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