They retard the ignition. You set a higher than normal advance, say, 23 degrees this will make for better running low down and starting. Then as the revs rise the preprogrammed curve in the chip retards the ignition by a fixed amount per 1000rpm. I can't remember what the figure is but for example 0.75 degrees per 1000 rpm so at 2000 rm you're at 21.5 , 4000 rpm you're at 20 and at 6000 18.5and so on
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"Our dilemma is that we hate change and love it at the same time; what we really want is for things to remain the same but get better."
Thanks Rosscla for the answer, I understand it a bit more now
Mine runs lumpy and 4 strokes at lowish revs/speed.
it's been on the dyno and the carbs been checked so hopefully the augsto will sort it out.
Cheers col