Hahahaha, they're funny, I like them! So windows.
The first sounds like a "log out" sound, the second like a "YOU HAVE A MESSAGE" thing, the third like a smart-TV menu sound, the 4th ACTUALLY sounds negative (like a desactivation of something), the 5th is like an "login/message" hybrid (it works for both things), and the 6th sounds again to "desactivation thingy".
Oh! yes, saturation is one of the basic processes in which you can modify sound, i dont know exactly what it is (i am not a technician), but it's some sort of compression. Basically, if you saturate a sound, what you're doing is distorting (which is compressing in a certain way) the frequencies and obviously making a more complex, rich sound plate. Saturating works for making sounds sound (ohhh yes, redundancy) more agressive and with more body/presence.
For example it is extremely used at hardstyle kicks.
well, i have to go!