Natural interaction command decoder implemented on small embedded microprocessors. The branch connector is inserted deeply into the through hole until the distal end of the branch connector is projected from the inner peripheral wall surface of the pressure accumulating container. The interactive session provides a virtual world. Next a base integration signal is generated according to the integration of the electromagnetic signal with the frequency f1 for a current integration period x. The production method includes reacting a ruthenium aromatic complex with an aromatic compound as a ligand of the ruthenium aromatic complex, In a sealed reaction container at a reaction temperature higher than the boiling point of the aromatic compound to produce a ruthenium aromatic complex having, as a ligand, an aromatic compound having a lower boiling point. A controller 11 outputs mute data representing silence of DSD data to a USB DAC 2 when it accepts pausing instruction while outputting DSD data to the USB DAC 2.