That kind of topic will get you to look huh! I had the pleasure of getting some mixing tips from a gentlemen nominated for a Grammy this year who recorded/mixed/mastered the nominated record all in Pro Tools. He offered to Master our album. He recommended taking a HPF and sticking it on the mix bus, set it to around 40hz. I won't set it higher 'cause I'm doing hip-hop. He was telling me about if I was recording to tape and how tape rolls off those frequencies. Yet Digital rolls off nothing. It really started cleaning up my low end the second I threw it on the mix bus! Mud was gone, I had "bump" and wasn't overloading the tiny speakers. Thought I'd share. Any devil's advocates? I welcome any more advice related to this. Enjoy.