In order to understand all of the game options available, I made the attached spreadsheet with the payouts for each pay table for each game. This is for Base M0000838 and Game G0002771. If you have a different chip set, there is still probably a lot of overlap and you can just modify it to suit your games.For the Keno games, I set it up so it calculates the payback percentage on each column separately, so you can see how many spots to mark to give you the best payback.

(Thanks to information found at
www.wizardofodds.com). I'm not sure how the single payback percentage that IGT came up with is determined. Really each different number of spots bet is like a separate pay table.
For the Slots, it doesn't seem that the pay tables change, although different payback percentages can be selected. So, I presume that the symbols on the reels are different from game to game. I do recall seeing some kind of pay table test option, in the menus, but I don't know how it works.
For Blackjack, the rules change, giving the player more options as the pay back percentage goes up. I didn't try to verify them.
I've changed my base chip to M0000837, which has more pay tables available (including >100% games), so I'll upload a follow-up when I go through those games.
If anyone has any documentation on this software, I'd appreciate seeing it.
(Added M0000837, which has more Video Poker Payables (> 100%) and different Keno paytables (all pretty bad odds, of course.)
(Added M0000843, which has far fewer payables. Everything > 98% is not there. Because of this a few games are completely gone.)