Sample Start, End (sample Edit View)

Hi,
someone is therefore kind to explain me like making to leave a loop from the point “S” and not from the beginning of the loop, to the pressure of a key on the keyboard in “sample edit”? Choosing “ping pong loop” I would want that this left from “S” in order then to arrive to “E” without that to every pressure the loop it shares from the beginning… thanks! ah, I forgot, but parameter “OFF” after a note, in the pattern editor, can be only inserted in phase of recording based on the time of pressure of the keys or it can be inserted also in stop?

greetings, PiT