Flexi disc given away with Contemporary Keyboard magazine in early 1977. Tom Piggot demonstrates to Arp Omni (1) keyboard.
More info at http://www.djfood.org/flexibition-12-arp-omni/

Tom Piggot - Arp Omni demo sound sheet

Strictly Kev aka DJ Food aka Openmind - Music producer, DJ and Graphic Designer. I've worked with and for Ninja Tune since 1993, designing covers, mixing radio shows and producing records as well as touring the world DJing. 

MOSTLY USING MY  @hasjiijsah ACCOUNT NOW ~
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Host of the Wednesday 1-4 on 95bFM [AKL]