I've been wondering for the last couple of months why my last song on radio didn't so that clear and powerful as in the studio. The I found out that quite a few people said that when you send/email or drop your song of for a radio station, that the overall RMS must not be over the -6db range...thus, don't compress or limit your song, but keep the song as is. I've attached a file where the overall range is say within this -6db limit. What should be the main focus to get this sort of song radio ready, since the song contains quite a few dips below -18db...? How do we keep the songs overall clear and punchy without going over the -6db limit and not using any compressor or limiters to get the soft parts up?