This paper reports the results of further experiments on the binaural unmasking of tones masked by broadband Gaussian noise and further theoretical work on the EC model of binaural unmasking. Data are presented on binaural unmasking for interaural time delays and/or phase shifts in the noise, and for statistically independent noise, at a variety of tone frequencies. Many aspects of these data cannot be interpreted by the preliminary version of the model, and consideration is given to some possible revisions of the model.