  We calculate the quasinormal modes of a nonsingular spherically symmetric
black hole effective model with holonomy corrections. The model is based on
quantum corrections inspired by loop quantum gravity. It is covariant and
results in a spacetime that is regular everywhere with a parameter-dependent
black bounce.
  Perturbations of these black holes due to massless scalar and electromagnetic
fields have been previously calculated and some intriguing results were
observed. For some modes, the frequency versus minimum-radius parameter
trajectories were found to spiral and self-intersect in the complex plane. In
addition, the spectrum of overtones has real frequencies that oscillate with
increasing overtone number, and may even vanishing for some overtones.
  We have calculated the quasinormal modes for all massless spin perturbations,
including spin-1/2, and axial- and polar-gravitational. We find that the
trajectory-spirals are restricted to scalar perturbations and observe some
interesting overtone behaviour for gravitational perturbations. The amount of
isospectrality violation in the gravitational quasinormal mode spectra is also
examined.
