I believe - without pirouette - pulsing 3b up and down as high and low as you can, slowly going higher, then lower a.s.o. at first, then pulsing faster and starting to `play´ with the different heights (be it continously raising and lowering, or else in a stacked ladder way), then at last simply skipping heights from low to much higher and vice versa will give good accurate flashes with ease.
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