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Our study encompasses the phenomena associated with gradual symmetry reduction in phononic crystals (PnC). As the lattice of the PnC is deformed, transmission spectrum shows a change in the shape, position and the size of the band gaps. More important, a pass band inside the stop band develops. The practical feasibility of the phenomena for a sensor application of a PnC is demonstrated for the 2D case of a solid matrix and liquid inclusions. A distinct pattern of the pass band build-up and its alteration induced by both the lattice deformation and the change of the material properties of inclusions are demonstrated.