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Article #313 (419 is last): From: xx004@cleveland.Freenet.Edu (Atari SIG) Newsgroups: freenet.sci.comp.atari.questions Subject: DELETING SOUND HARMONICS Reply-To: as195@cleveland.Freenet.Edu (Joseph Pallendino) Date: Fri Nov 6 11:38:21 1992 My XE SYSTEM (65k bytes-game machine) has an audio output jack & I can put out 800 hertz but it's a square wave. I'd like to filter everything above 800 hertz including very much higher like 50 kilo hertz or higher which is also coming from the audio jack. Any suggestions?