oh and a quick google search shows up:
"Stick Features (AC/DC):
Tailored arc control (DIG) allows the arc characteristics to be changed for specific applications and electrodes. Smooth running 7018 or stiffer, more penetrating 6010." on http://www.millerwelds.com/products/tig/dynasty_200_series
i have a dynasty worth every penny! the DIG i believe is the same as arc force just a yankee name for it....
iv never needed to play around with it to be honest.
sometimes machines have more settings on than needed and it just causes confusion...
im assuming... i dont really play with it much i am not used to all these fancy settings i get what im given and make it work just have a play around and see