Hey dude,
I have one. Each setting affects the settings of the others. It's a pain in the arse to tune on the road.
The settings would vary from car to car too, depending on your turbo, air filter, and exhaust.
Here's my setting for 11psi
1997 r33 gtst, full 3" exhaust, hi flow cat, pod air filter, and fmic.
HI
Boost -> 50%
Gain -> 15%
Set Gain -> 53
Warn -> 14
Peak -> ON