A method of controlling a personal acoustic device comprising an inner microphone disposed within a cavity of a casing of an earpiece of the personal acoustic device and an outer microphone disposed on the personal acoustic device so as to be acoustically coupled to an environment external to the casing of the earpiece, the method comprising: performing a first analyzing of an inner signal output by the inner microphone to determine if a buffet event has occurred, the buffet event being an event that causes a physical vibration of the earpiece which results in an acoustic pulse inside the earpiece having energy primarily at frequencies below 10 Hz so as to be detectable by the inner microphone but not the outer microphone; performing a second analyzing of at least one of: the inner signal and an outer signal output by the outer microphone, by means of a voice activity detection, VAD, module of the personal acoustic device, to determine if a voice event of a user of the personal acoustic device has occurred; in response to determining that a buffet event has occurred and that a voice event of a user of the personal acoustic device has not occurred, performing a third analyzing of the inner signal and the outer signal; determining an operating state of the personal acoustic device based on the third analyzing of the inner signal and the outer signal, the operating state comprising a first state in which the earpiece is positioned in the vicinity of an ear and a second state in which the earpiece is absent from the vicinity of the ear; and initiating an operation at the personal acoustic device or a device in communication with the personal acoustic device when the determining of the operating state of the personal acoustic device indicates a change in the operating state. performing a first analyzing of an inner signal output by the inner microphone to determine if a buffet event has occurred, the buffet event being an event that causes a physical vibration of the earpiece which results in an acoustic pulse inside the earpiece having energy primarily at frequencies below 10 Hz so as to be detectable by the inner microphone but not the outer microphone; performing a second analyzing of at least one of: the inner signal and an outer signal output by the outer microphone, by means of a voice activity detection, VAD, module of the personal acoustic device, to determine if a voice event of a user of the personal acoustic device has occurred; in response to determining that a buffet event has occurred and that a voice event of a user of the personal acoustic device has not occurred, performing a third analyzing of the inner signal and the outer signal; determining an operating state of the personal acoustic device based on the third analyzing of the inner signal and the outer signal, the operating state comprising a first state in which the earpiece is positioned in the vicinity of an ear and a second state in which the earpiece is absent from the vicinity of the ear; and initiating an operation at the personal acoustic device or a device in communication with the personal acoustic device when the determining of the operating state of the personal acoustic device indicates a change in the operating state. <EOS>