I have a similar workflow to John, in that I keep track of what is plugged into the mixer
and what the controls are set to.

However, instead of writing it ALL down, I just grab the digital camera and take a quick
"zoomed in" snapshot. Then when I re-position the plugs or change the knob settings,
I can always look up what things were set to before.

Now I just have to write down which snapshot worked the best!

Good luck!
LLOYDS