I did a few of these back in the day, on extremely low budget events - one even using manual advance and a glass bell recorded for the slide change cues! The music was the best part on that one, and the editing of the narration...

But I write because the description below sounds like exactly what PowerPoint does today - which makes me wonder if that would be a suitable medium for preservation of image and sound presentations? Is the resolution too low? Perhaps if there was a need for public viewing that would work, anyway.

L

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On Aug 6, 2012, at 11:11 PM, John Schroth <[log in to unmask]> wrote:

> Where you say A, B and flash, I understand what you are saying. This was a common design for multi-image programs where a background was held for a period of time and images were inserted in boxes or other types of image hold-back designs on the background. Actually any projectors in the bank could hold the background slide, with other projectors being insert images for the background. You would want to cycle or change the projector that held the background, from time to time, so that you don't end up with one projector that just held one background slide image in the tray while the two other projectors had full trays of insert images. Cycling the background slide from projector to projector gave you more total slides to project (if needed). Also in most shows, the design of the backgrounds would change from time to time throughout the show, allowing you to switch which projector held that background. Simple shows would dissolve between two projectors with a third holding the background. In more complex programs there could be six, nine or twelve projectors in a nest/bank and backgrounds would change constantly with the remaining slide projectors filling the insert boxes in the background.