focus algorithms

Getting a little closer to understanding this.
Use donut buster, SEP profile default donut using backlash zero and AF Ovescan = 100
Using gso203 f4.9 with TS RAP focuser and Gemini EAF 

Walk: Classic

To begin, the focuser is moved outward by:
Initial Step Size * Out Step Multiple

example
Initial Step Size 20 
Out Step Multiple 4
OUT = 80

Walk: Fixed Steps

To begin, the focuser is moved outward by:
0.5 * Initial Step Size * Number Of Steps

example
Initial Step Size 15
Number of Steps 9
OUT = 67.5