Alphatig 201xd Pulse equivalent settings

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I used the pulse feature on this machine, pretty nice.I am still trying to translate generic terminology about pulse settings as described in general by Jody and how the controls are named on the alphatig.Jody:% on time (% ratio set)Background currentOn the alphatig 201xd:Pulse time on (PTO)Pulse amps (PA)Pulse frequency (PF)Main ampsI was trying to get a narrower lap-joint on some 1/8” steel and was welding at 105A, with 3/32” 2% lan and 1/16” filler, on the the following settings:PTO-80%PA-50PF (7-30)i think I like the upper range of the low, and lower range of the high, but don’t know why I like it. Can someone PLEASE explain PTO and PO.