There is provided a first die in which a plurality of projections are arrayed in a first direction with a fixed pitch. The amount of time to compensate the three-phase unbalanced voltages required for detecting an unbalance of voltages and generating a control signal can be shortened. The optical response of the doped oxide materials results from the high carrier concentration of the doped metal oxide, and the resulting impact of changing gas atmospheres on that relatively high carrier concentration. In this manner, the sound system automatically tunes to a new radio station when the current radio station broadcasts content that the user of the sound system has indicated a dislike thereof. Optionally, a removable cap is present for sealing the angled branch, to prevent the flush water from exiting the angled branch.