Rogge, assuming each of your 15 songs have been recorded individually in separate song files, far as I know you can't copy the settings directly from one recorded song to the other 14 recorded songs after they've all been recorded.
The only solution I can think of would be:
(a) load, save and protect the one song you've completed (let's call that "song#1").
(b) after loading "song#1", create a new song called "mixdownset", then save it and and assure it's protected. This will carry over into an empty song all your "song#1" settings except the fader settings from "song#1".
(c) load "song#2" and export all the tracks to Audio Depot.
(d) load the empty "mixdownset" song, then save it as "song#2mix", and unprotect "song#2mix". This retains "mixdownset" as an empty song for use again later and applies the settings used in "song#1" to "song#2mix".
(e) import all the "song#2" tracks from Audio Depot into "song#2mix".
(f) mix and master "song#2mix".
Repeat for the remaining songs ("song#3"/"song#3mix", etc.) If the fader settings will be the same for all the remaining songs, just leave them as they were for the "song#1" mix.
Others may have alternate methods that may work better for you, so give folks a little time to respond.