Welcome to the forum!
This is the key to me - so far, you've enjoyed it. That is the most important thing to remember. The different available sound modes exist to help people enjoy their systems. I'd encourage you to try them out to see if you like one over the others, but you might not notice a lot of difference. Some of the sound modes are to convert the source audio so that it plays through more speakers (e.g. stereo sound to play through five speakers, or 5.1 audio to play through seven speakers).
I have a VSX-23, and I've found that I like the THX modes. That's just my personal preference, but it's what I like.
If you meant something different by "settings," please just let us know. I always have the MCACC settings on, and I have Phase Control always on. If you sit in different locations throughout your room, you would benefit from running MCACC at each of those locations and storing the settings under a different configuration...and then switch the appropriate configuration when you move seats. I don't mean moving from one cushion on a coach to a different one, but rather moving from a couch in the center of your room to a chair off to the side or a bar stool in the back corner.