If i am sending my guitars to an aux channel with a compressor plugin on via a bus should my Aux Effects channel be a stereo channel or a mono
channel? If stereo and i have 2 mono guitars should each guitar be sent on a differnet bus to the stereo Aux with compressor on and then route that Aux to the group stereo bus?

What sort of compression would you recommend as a starting point for Distorted Elec Gtrs, Clean Elec and Acoustic Guitars (threshold, ratio, atack, rel)

Also I have T-Racks and also Wavelab (Waves plugins, Ozone etc). What would you guys recommend for mastering?