My gear was 2nd hand and I couldnt quite remember what lines to tie to what notches
I found a link that I cant post, but heres a cut paste:
"For the purpose of this I will number the knots-
Closest to kite
Middle Knot
Farthest from kite
L = Front Lines
T= Rear Lines

Many combinations will give exactly the same results-

L1+T1, L2+T2, L3+T3

L1+T2, L2+T3

L2+T1, L3+T2 (Not that you would use these)

I would suggest the following-

L2+T2 For your standard settings on most days.
L2+T3 For winds over 22knt
L1+T3 For winds over 28knt
L2+T1 For winds under 13knt

Hope this helps in some way."

I was never going to remember Old Sons formula without visual aid so decided to draft up my own little chart for translative purposes.
The link seems to be particular to a 13m Slingshot Rev, I have a 15m Rev and am a hugeman so will use those formulas. Not sure whether they translate to other brands or what?

As Im a noob, if anyone can chime in and let me know if anything is incorrect I will amend it accordingly.
Cheers Ears ;)