A system and method for mitigating audio feedback may calculate a smoothed frequency spectrum of an audio signal. When magnitude of the current in response to the detection signal is lower than a threshold current and battery capacity of the battery back is higher than a predetermined capacity, the controller outputs a set of control signals to turn off the first switch and turn on the second switch. A source region is defined within a top surface of one of the pair of mesa regions, and a drain region is defined within a top surface of the other of the pair of mesa regions. The ruthenium oxide zone is interposed between the ruthenium zone and the ruthenium-rich zone. The methods include applying a medium chain peroxycarboxylic acid composition to poultry or to the surfaces.