An automatic filling stuffing apparatus aims to automatically stuff filling in an elongated and unprocessed pastry. The described compensation of errors in components connected upstream of amplifier stages takes place through a corresponding calibration of the amplifier stage. The elastic section is formed inside the connecting assembly and can be provided on an exterior thereof. 01 to 50% by weight, based on the particles, of a compound represented by formula : . The acoustic energy may be developed by vibrational sources, laser energy, or other sources.