An audio message recording and playback system including a recorder-imprinter device, a self-contained voice module for playback of an audio message and a number of input devices for initially recording the audio message to the recorder-imprinter device. The composition comprises a layer of piezoelectric material disposed on the surface and a layer of electrically conductive disposed on the layer of piezoelectric material. One of the laser beams is a pre-heat laser beam and the other laser beam is the annealing laser beam. The voltage regulation is achieved through speed and load coordination that is based on a machine reactance specially selected and calculated to achieve compensation between the external voltage variation and the internal machine voltage drop, resulting in substantial savings in electronics hardware. The force has a component that is transversal to the Bragg grating and effects a change in strain of the Bragg grating and thereby a change in an optical period of the Bragg grating.