Thanks for mentioning the buttons, Studio717, because I really might not really say anything about them. I guess I basically ignored them because they weren't of interest to me.
As far as the page rotate, I think it's not complicated. (Well, me trying to explain it here in words might sound complicated, but the idea is simple.) Here's the working assumption that I've made, and it's been useful for me so far:
When you first start scanning, you are scanning page 1 no matter how the book is aligned or what you are scanning. So the sequence as far as OpticBook is concerned is always ODD, EVEN, ODD, etc
Suppose you know the next scan is going to come out upside down (for example, if you "fool" the scanner by scanning two odd pages in a row, or two even pages in a row, or if you are rescanning the same page for a second time in a row). Then you just change the setting to the opposite value. In other words, if it is rotating odd pages, then set it to rotate even pages. And if it is currently rotating even pages, set it to rotate odd pages. That will get it back on track.
If you approach it that way, I think you'll find it's less confusing, and you really don't have to know anything about how it calculates things internally. Just remember that OpticBook doesn't know which way you are laying the book down, so you can't determine much by whether the "real" page being scanned is an even or odd number in the book.
One more note... if I remember correctly (maybe someone can help me out on this), the preview doesn't show the rotation (does it?). If that's true, then if you get lost, you can't really tell ahead of time whether that next scan will be upside down or not, without some mental gymnastics. In that case, I simply scan it and look to see what happens. If it's upside down, delete the scan and rescan it. It will be right side up next time, and then you can proceed. No change of settings is necessary.
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