All right, after experimenting this weekend I'm not sure I still understand any of this but I can give you more information.

There are a number of valves in the pool loop, but I can identify the workings of the solar and pump valves. As a year has passed the markings identifying the other two valves are unreadable, but they appear to be the ones routing water to the pool and spa in various ways.

I manually switched the various choices I have -- pool mode, spa mode, and spa fill (I didn't do spa drain since the spa mode effectively does this and I have no doubt the spa drain one would as well :>). The various choices I made along with what it does to the valve I took photos of and they are posted here:

http://www.kelleytown.com/pool_valves.htm

You can click on any image to enlarge.

When I turn it to pool mode water appears to come into the spa and spills over into the pool, and the pool cleaning system (in floor) operates. When I turn it to spa mode the water drains out of the spa and as it reaches the bottom water is still coming in from the spa valves (but obviously not enough to offset the drain process) but it comes in very slowly. When I turn it back to pool mode the water shoots back into the spa vigorously until the spa fills back up and starts spilling again. When I turn it to spa fill it does fill the spa until it starts overflowing but even in spa fill it appears water is being routed to the in floor cleaning system.

Hopefully this will make sense to you. I will greatly appreciate any direction you can point me to.