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Tom, Didn't you provide me with some half speed CAT 22 cards eons ago? I think I still have them. If you weren't the source, I don't know who was, but I have/had some. Never used them. Cheers, Richard On 2015-03-12 8:49 AM, Tom Fine wrote: > I do think they pioneered this, going back to SONAR training equipment > in WWII. > > Speaking of half-speed cutting, I have never understood how this is > pulled off in a modern context, especially with Dolby-encoded master > tapes. -- Richard L. Hess email: [log in to unmask] Aurora, Ontario, Canada 647 479 2800 http://www.richardhess.com/tape/contact.htm Quality tape transfers -- even from hard-to-play tapes.