A bass drum microphone device for securing a microphone inside a bass drum comprising a first support bar, a second support bar, and a cross support bar, and the bars connect to form an H-shaped structure. Other embodiments are also described. The case member includes a base member, and a cover member having a snap-fit part and configured to be fit in the base member, the cover member and the base member being snap-fit connected via the snap-fit part. That is, the operating specification of the option functional part is automatically decided according to the program state of the programming element before the power-on operation is completed. The functional blocks output a block-to-block synchronizing signal at an output timing of a processed informational signal that has been performed on the basis of the global command.