But as far as threshold goes, -25 & sensativity @5 is recommended for newbies because it seems like one of the most stable settings. The lower you go in minus (-) the more stable it is, example -40 is more stable then say -25. The higher toward Plus (+) you go, the more unstable it can or will become. Threshold is really what you can stand as far as instability.
But, the main thing to remember is from what I've been told and from what I have determined with what testing I have done, is the lower you the negative or minus you go the less depth you get. Example: -5 has more depth at sensativity 5 then -25 has. Its not much from what i can tell, but there is a difference.
I've got close to 40 hours on mine by now and I will run threshold -10 sensativity @ 8 until it becomes to unstable then I start dropping the settings back until it becomes more stable. I can't stand a bunch of pops, clicks, chirps all the time, it drives me nuts. Thats one of the reasons I wanted to wrap the C$ around a tree the first 15 hours I used it.
Good luck on the C$, if you give it enough time, you will really like,
HH,
Mike