  In the model the entire high-energy part of the amplitude (Regge power
dependence from the total energy) comes as consequence of Gribov's diffusion of
the constituent quarks in the space of rapidities and impact parameters. Charge
exchange of the quarks, which goes at small quark anti-quark invariant masses,
is described by low-energy Nambu - Jona-Lasinio model. It is shown that spin
structure of the amplitudes and dominating spin-orbit (spin-flip) amplitudes
are well described by this model without free parameters.
