  Motivated by the 1/Nc expansion, we present a simple model of pion-pion
scattering as a sum of a `current-algebra' contact term and resonant pole
exchanges. The model preserves crossing symmetry as well as unitarity up to 1.2
GeV. Key features include chiral dynamics, vector meson dominance, a broad low
energy scalar (sigma) meson and a `Ramsauer-Townsend' mechanism for the
understanding of the 980 MeV region. We discuss in detail the `regularization'
(corresponding to rescattering effects) necessary to make all these nice
features work.
