  We deduce continuity properties for pseudo-differential operators with
symbols in Orlicz modulation spaces when acting on other Orlicz modulation
spaces. In particular we extend well-known results in the literature.
  We also show that the entropy functional is continuous on a suitable Orlicz
modulation space between $M^p$ and $M^2$ when $p<2$, though the functional is
discontinuous on $M^2=L^2$.
