  We consider the isospin one-half example system, with $D \,\pi , D\,\eta, D_s
\bar K, D^* \pi , D^*\eta, D^*\bar K$ coupled channels in the $J^P = 1^-$
partial wave, chosen such that various phenomena that come with the opening of
an anomalous threshold can be illustrated in a step-wise procedure by a
suitable variation of up, down and strange quark masses. We use a set of LEC in
the chiral Lagrangian that were adjusted to a large set of Lattice QCD results.
The six phase shifts and inelasticity parameters are presented for various
choices of the pion mass. For a pion mass of 150 MeV there are no anomalous
thresholds encountered. The small change from 150 MeV to 145 MeV pion mass
causes a dramatic impact of the anomalous threshold on the phase shifts.
