+1 to what Jeff is saying. It is most unwise to master while outputing a mix. 
Composing and writing
Rehearsing, playing it live 
Recording and tracking
Overdubs and turd polishing
Mixing 
Mastering
Replicating
Marketing

Hi there:)
 
Thanks to all for answering, but I've decided to master the old Songs again, I like the Dynamic and the Sound much more than the Loud mastered old songs!!!!
They are all mixed to -3 dB Peak and about -15 to -20 dB RMS, so it's very OK for me to Master them to -15 dB RMS or LUFS (it's nearly the same)  and do just a little Final Equing and BASTA:)
Perhaps a Minimum of Compressing, and the Band will hear the Difference to the Loud Sounded Sh....! I hope so;)
 
Thanks and have a nice day or night, wherever you are:)
Heinz.