409.10 tests various conditions
409.11 testing various conditions - initial direction = true
409.12 testing various conditions - initial direction = false, do not adjust accumulator for direction reversals
409.13 testing various conditions - changes segment length computation
409.14 testing various conditions - hard-wire segment time to nominal segment time value
409.15 testing various conditions - 409.14 plus no step correction
409.16	// testing various conditions - 409.14 plus threshold = 4
409.18 testing various conditions - some refactoring on 409.16 - no functional changes - threshold set back to 1