The sonic pitch device, an ultra-secret gadget, is one of Darkwing Duck's many tools to fight crime.
Darkwing Duck is pressured into proving his legitimacy as superhero to the people of Mertz. He does so by showing off his gadgets; first the gas gun, then the sonic pitch device. The sonic pitch device is taken from him by Comet Guy in curiosity, who experiments by turning up the dial. He and the others from Mertz are discovered to be immune, but Darkwing is severely pained by the frequency. Upon noticing, Comet Guy turns it off.