Reading these two articles have spurred some questions for me:

http://www.rane.com/note135.html
http://www.prosoundweb.com/article/how_ ... structure/
My understanding, dating back when i was installing car audio, was that you set the source of your music to the max clean signal output. Then set up each individual piece in the system to it's max clean signal. Once every piece in the system is now at it's max clean signal, you can set the amplifier sensitivity for X voltage. That way, as long as the guy behind the main volume know doesn't turn it up past the source's max clean signal, you will get a very clean output, with lot's of headroom.
I may have misread, but reading the 2nd article, it would seem that they want you to set up the board to max clean signal... measure that out put, then match each other piece in the chain to that voltage, then set up amp sensitivity?
SO..
What's the right way to set up gain? IE use an oscilloscope to see the clip.
What's the cheap fast way to set up gain? IE use a 1K tone until you hear a tone pitch change.
What's acceptable?
And what is considered down right wrong?
Here is my set up.. in a nutshell...