Evatone closed up shop in 2000. The article sourced here errs in stating that the first flexidiscs were Roentgenizdat; they were a wholly unrelated development. Evatone's soundsheets were based on a French patent from the 50s. There is a whole range of flexible records going back to Marconi, but a Soundsheet is something specific. best, David N. Lewis Hamilton, OH On Tue, Apr 21, 2015 at 12:24 PM, Malcolm Rockwell <[log in to unmask]> wrote: > 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 > > ******* > > > On 4/21/2015 3:13 AM, Doug Pomeroy wrote: > >> Years ago the Audio Engineering Society issued two Flexidiscs >> of auditory illusions. One by Diana Deutsch of the University >> of California at San Diego, and the other by Michael Kubovy >> and Jane E. Daniel of Rutgers. Fascinating illusions, one being >> a descending tone which doesn't really descend! >> >> Doug Pomeroy >> Audio Restoration and Mastering Services >> [log in to unmask] >> >> >> Date: Mon, 20 Apr 2015 19:17:39 -0700 >>> From: Lou Judson <[log in to unmask]> >>> Subject: Re: Flexi Discs are back >>> >>> Hah! While we reminisce, I still have a National Geographic one that = >>> even has a cardboard sleeve, called Sounds of Space, which I should = >>> listen to again. >>> >>> And as a teen I had the Mad Magazine song =94She got a Nose Job=94 = >>> (=93It=92s now turned up instead of hanging down=85=94) to the tune of = >>> Get a Job. I think. >>> >>> Yup: <https://www.youtube.com/watch?v=3DeCuiN2JnjpE> >>> >>> Sounds like they had fun recording that one. >>> >>> <L> >>> >>> Lou Judson >>> Intuitive Audio >>> 415-883-2689 >>> >>