  In a recent paper in Appl. Comput. Harmon. Anal. 38(2), 196--221 (2014) we
have introduced and studied the notion of weak Hamiltonian deformation of a
Gabor (=Weyl-Heisenberg) frame. In this Note we use these results to prove that
one can modify the window of a Gabor frame using certain metaplectic operators
provided that one modifies only a finite number of points of the frame lattice.
