I had this problem with the very first wav file I tried to render. Someone posted to add +10 Db at the bottom right of the rendering page, before hitting render. This has worked for me as far as volume only. Not quality of recording. That I try to do with effects and especially the Pg dynamics plug in seems to really add punch. Especially in RB where you can BEEF up individual tracks in the mix. (Not just volumes here, but quality, effect wise.) As Mac says, we will never achieve a true mastered quality sound at home, probably, but many I have heard on this forum are very close.