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This can be used to supplement the normal vehicle horn and is useful at intersections or in low noise areas. This tone overrides other siren tones. Horn may be disabled. See OPTION SWITCHES section. MICROPHONE The attached noise-canceling microphone is used for public address operation and overrides any siren tone when the button on the side (PTT) is pressed. VOLUME CONTROLS Controls are provided for radio repeat volume and public address VOLUME volume. These should be set when the vehicle is pa