Hi Mike, and welcome.
Right off, I wouldn't suggest doing a lot of experimenting. I don't run an X terra Pro, but you did the right thing right off going with the factory default settings and I would suggest staying with them until you get some good time in with the unit. Listen to the tone differences between various items of trash and coins and simply get real familiar with the unit. If you know of a tot lot hit it early Sat or Sun morning when know one is around and dig/scrape up targets. Typically such a spot will have some varied targets and nice numbers of coins. Good luck, have fun, it's a terrific hobby. HH Jim Tn