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Mal, I just listened to it. It is electronic, not singing. And it's not very convincing either. Doug Pomeroy Audio Restoration and Mastering Services [log in to unmask] > Date: Tue, 21 Apr 2015 06:24:45 -1000 > From: Malcolm Rockwell <[log in to unmask]> > Subject: Re: Flexi Discs are back > > I remember this illusion from a presentation given around 1982 at the > AES in Los Angeles at the Disney Convention Center. If there is an MP3 > available of that descending tone I'd like to hear it. I believe it was > actually sung by a chorus. > Malcolm