has not crossed the pond to the United States.
(n.)2. a device able to modulate at low levels consisting of plastic (static free), paper like products (including post-it notes, legal paper, computer paper etc…) in a box or circular form. Used mainly to keep long, flowing objects in place (garland, tinsel, etc…).
2.) “Wow”, said Jane, “that modulator valve keeps the tinsel from hanging down and tree looks so much more beautiful.”