To provide a substrate processing method and a semiconductor chip manufacturing method that enable low-cost formation of a mask for etching using plasma etching. The device also includes a selectable weight attachable to the spring section and a first flexible elongate pad having a width and length proportioned for engagement about the penis. For this reason, even when the requirement for downsizing and reducing weight is met, an amount of a gas generating agent does not have to be reduced. The microphones are installed with the on-microphone setting in which the microphones are positioned close to sounding members of the natural musical instrument. A transport signal is also evaluated and a transport signal validity indicator value is then created. The amplifier control device comprises a control unit which changes a current supplied to the amplifier depending on whether or not the first signal supplied to the amplifier is used for image data.