  This talk is on a refined investigation on light flavor meson-baryon
scatterings, using a dynamical coupled-channel approach, i.e. the J\"ulich-Bonn
model. The previous channel space of $\pi N$, $\pi \Delta$, $\sigma N$, $\rho
N$, $\eta N$, $K \Lambda$ and $K \Sigma$ is extended by adding the $\omega N$
final state. The spectra of $N^*$ and $\Delta$ resonances are extracted, based
on the result of a global fit to a worldwide collection of data, in the energy
region from the $\pi N$ threshold to center-of-mass energy $z=2.3$ GeV
(approximately $300$ parameters against $9000$ data points). A negative value
of the $\omega N$ elastic spin-averaged scattering length has been extracted.
