Relaxation possibilities of the human brain mechanisms are correlated to the synchronization processes between a particular sound stimulus and the brain patterns. Research about the signal ranges, frequency range, frequency inter-signal separation, intensity, or other complex models in signal synthesis, as for example, the binaural pulse generation have been widely studied. The present paper summarizes the results about the possibilities for obtaining relaxation through binaural sound playback. Here, these relaxation states are induced for therapeutic purposes. Some tests and experiment validation are performed with Biofeedback technology.