"Any figure starts at a neutral level and there may be a slight lowering at the very beginning of the first step. It is a coincidence when you have the luck to come from a figure of a higher level of rise and then you can use this "potential energy" at the end of the preceding beat, but there are also figures with no rise before."
We have to be very carefull to distinguish between an official lowering action, and any old loss of altitude. The lowering action must be complete by the end of the final step, and must not continue into step 1. However, as you reach the full division of your legs you will naturally be somewhat lower in alittude than you were when you had them together, even though your legs are straight at full extensions and should have been somewhat flexed when you are over them. This difference in height is NOT considered lowering, because it is not a result of one of the acknowledged mechanisms of rise and fall. A common problem however is that many dancers fail to finish the official lowering action before the end of the final step, and thus loose altitude in step 1 not only as a result of leg division, but also by improperly continuing the lowering action.
It is essentially unheard of to dance a characteristic upswing that is not preceded by a lowering action in a downswing of some sort. You can start from the halfway lowered position when you commence from a prep step, and you can stay down for an extra step between the lowering and the rising, but you cannot just start and upswing from a standing start and call your dancing coordinated.