And please don't give me the 'whatever sounds best' routine, we've all heard that one before
Considering the fact that you're asking for help, you're acting like a bit of a dick to be honest.
The big reason that "whatever sounds best" is a common answer is because it is always the best answer!
What tracks in YOUR mix have excessive and unnecessary high frequency content? Those are the tracks that will require a low pass.
Notice the word "your"
Other people have different sources and different mixes, so it's not actually alot of help to know the specifics of what they're doing.
I find that I use low passes pretty rarely, the only ones that seem to be set in stone for me are:
Room mic's - To tame excessive cymbal wash
Guitars - To tame high frequency fizz, anywhere from 7-12k depending on the source and the song
Other than that it's all up in the air and has to be judged on a individual basis depending on the source.
Maybe you're boosting the highs on you kick and are getting a nice smack, but too much click? Get your low pass out to the kill the click.
Maybe you have alot of cymbal spill in your drum spot mic's? You could low pass there to see if it helps tame it without losing the brightness of the drums attack.
Maybe there's some really horrible spiky clank on the bass track that's popping out in a bad way? Try a low pass to see if you can kill the clank without losing the aggression and attack.
The big thing is to try it out on your stuff and see what works. If you really want to get better at recording and mixing you have to learn to trust your own ears in evaluating sound sources. Not rely on doing what your told by whoever happens to see your thread on the Sneap forum.
