I tried with both, John Zibell, running engine and just the on position.
I'll be able to give it another go after the holidays, traveling in a car...
Canuck, I will try your recommendation with varying touch durations once I get to the Stelvio again. I think, Bonaventure suggested the same thing.
If that turns to be true, then this one is more capricious than a Caprese salad