A method of operating a wearable audio output device, comprising: at a computer system that includes the wearable audio output device, wherein the wearable audio output device is in a physical environment, and one or more input devices: operating the wearable audio output device in a first audio output mode; while operating the wearable audio output device in the first audio output mode, receiving , via the one or more input devices, a first input corresponding to a request to transition the wearable audio output device from the first audio output mode to a noise-cancellation mode, wherein, while the wearable audio output device is in the noise-cancellation mode, audio outputs that are provided via the wearable audio output device include one or more cancellation audio components selected so as to at least partially cancel ambient sound from the physical environment; and characterized by : in response to receiving the first input : in accordance with a determination that a first wearable audio output component of the wearable audio output device is in an in-ear position relative to a first ear of a user and that a second wearable audio output component of the wearable audio output device is in an in-ear position relative to a second ear of the user, transitioning the wearable audio output device from the first audio output mode to the noise-cancellation mode; and in accordance with a determination that one of the first wearable audio output component or the second wearable audio output component is not in an in-ear position relative to a respective ear of the user, forgoing transitioning the wearable audio output device from the first audio output mode to the noise-cancellation mode. operating the wearable audio output device in a first audio output mode; while operating the wearable audio output device in the first audio output mode, receiving , via the one or more input devices, a first input corresponding to a request to transition the wearable audio output device from the first audio output mode to a noise-cancellation mode, wherein, while the wearable audio output device is in the noise-cancellation mode, audio outputs that are provided via the wearable audio output device include one or more cancellation audio components selected so as to at least partially cancel ambient sound from the physical environment; and characterized by : in response to receiving the first input : in accordance with a determination that a first wearable audio output component of the wearable audio output device is in an in-ear position relative to a first ear of a user and that a second wearable audio output component of the wearable audio output device is in an in-ear position relative to a second ear of the user, transitioning the wearable audio output device from the first audio output mode to the noise-cancellation mode; and in accordance with a determination that one of the first wearable audio output component or the second wearable audio output component is not in an in-ear position relative to a respective ear of the user, forgoing transitioning the wearable audio output device from the first audio output mode to the noise-cancellation mode. in accordance with a determination that a first wearable audio output component of the wearable audio output device is in an in-ear position relative to a first ear of a user and that a second wearable audio output component of the wearable audio output device is in an in-ear position relative to a second ear of the user, transitioning the wearable audio output device from the first audio output mode to the noise-cancellation mode; and in accordance with a determination that one of the first wearable audio output component or the second wearable audio output component is not in an in-ear position relative to a respective ear of the user, forgoing transitioning the wearable audio output device from the first audio output mode to the noise-cancellation mode. <EOS>