  In solv-int/9812016 it was shown that the Veneziano amplitude in string
theory comes naturally from one of the simplest solutions of the functional
pentagon equation (FPE). More generally, FPE is intimately connected with the
duality condition for scattering processes. Here I find the amplitude that
comes the same way from a solution of the functional tetrahedron equation, with
the duality replaced by the local Yang - Baxter equation.
