Tune slider

I guess My little brain is foggy.Does the slider do anything? If the alc setting is in the VARA module then it does nothing,RIGHT? If it does then where do you read the slider setting?I looked in the book but can't find any mention of this.Yes my VARA is liscensed.(4.4.2) and varac (3.8.8).This is a much better program than others various groups( mars,ares,etc) are using.As in Olivia.mt63...Anxious to make a qso soon..73 john