Using a slider bar to show progress through course

I am using a slider bar to show how far into the course a user is. I have been manually making the changes to the slider on each slide. I am sure there is an easier way to do this a a variable, but I have never quite mastered them. Basically I just want the slider to advance one position each time the user moves tot he next slide. Is there a way to add the slider to the master slide and have it add 1 position each time the user clicks next instead of having to add a slider to each slide and then set the placement of the thumb in the format section for each slide? Do you have to add a trigger on each slide telling it how for to advance the slider? So many questions and so much confusion...

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