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An improved description of four-pion production in electron-positronannihilation and in tau lepton decays is presented. The model amplitude isfitted to recent data from BaBar which cover a wide energy range and which wereobtained exploiting the radiative return. Predicting tau decay distributionsfrom e+e- data and comparing these predictions with ALEPH and CLEO results, thevalidity of isospin symmetry is confirmed within the present experimentalerrors. A good description of two- and three-pion sub-distributions isobtained. Special emphasis is put on the predictions for omega pi (->pi+pi-pi0) in e+e- annihilation and in tau decay. The model amplitude isimplemented in the Monte Carlo generator PHOKHARA.

Four-pion production in tau decays and e+e- annihilation: an update