A parameter setting apparatus includes a first display device, a first operation controller, a mode operation controller configured to receive either designation of a first adjustment mode for adjusting a send level or a second adjustment mode for adjusting a first parameter other than the send level, and a processing controller. The controller includes a processor. The processor controls the first display device to display a bus selection screen on the display device, selects a bus based on an operation on the displayed selection screen, causes the first operation controller to adjust a send level of the selected bus upon the mode operation controller receiving the designation of the first adjustment mode, and causes the first operation controller to adjust the first parameter upon the mode operation controller receiving the designation of the second adjustment mode.