This is a practice point for the pivot string-cross passage in Bars 1 to 4.
To produce a ringing sound, use as little string-cross action as possible.
By moving from double stops to the string-cross version you become aware how only a small string-cross action is necessary, regardless of the length of the bowstroke.
Practicing with double-stops will also help you find the correct right-arm level between the pair of strings....
