Guys, if memory serves correctly (and this is a BIG "if"), I think he's referring to the adjustment available on the power valve. Some sort of spring tension adjustment that affects when the the valve opens, thereby adjusting the "powerband". I don't know ATK's well enough to say this with all certainty.
Granted, it's strange terminology, but there have been several bikes with this feature over the years. I think Moose even sold different springs for certain models to tailor power delivery.
My 2 cents.