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The preset panel is a set of terminals which allows the user to rewire the C# through A presets. This panel is accessed from behind the organ.
How to change - Page 15 in A-100 mannual 
http://www.theatreorgans.com/hammond/faq/a-100/a-100.html
Here's a picture of a preset panel:
(Often, a little cloth bag of screws (for altering the presets) is found hanging on the preset panel.)
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