An integrated circuit, comprising: an audio circuit configured to generate or receive at least one audio signal (hs1-hs4); multiple electrical terminals adapted to couple the audio circuit to an external transducer device (3A, 3B), the external transducer device (3A, 3B) being a headset in the form of a pair of earbud speakers (8A, 8B), one of which includes a microphone element, wherein the multiple electrical terminals include a first terminal and a second terminal configured for providing audio signals to the external transducer device (3A, 3B), a third terminal configured for connection to a first one of either a common return signal for the earbud speakers (8A, 8B) and the microphone element or a microphone output signal of the microphone element, and a fourth terminal configured for connection to the other one of either the common return signal for the earbud speakers (8A, 8B) and the microphone element or the microphone output signal of the microphone element; a transducer device type detection circuit configured to detect a type of the external transducer device (3A, 3B) when the external transducer device (3A, 3B) is coupled to the integrated circuit from characteristics measured at the multiple electrical terminals, wherein the transducer device type detection circuit includes a bias generator configured to generate a bias voltage for operation of the microphone element included within the external transducer device (3A, 3B) and during detection of the type of the external transducer device (3A, 3B) to apply a voltage to at least one of the multiple electrical terminals and a measurement circuit configured to determine whether or not the microphone element is forward biased by the applied voltage, wherein the transducer device type detection circuit is further configured to measure a voltage or current on the at least one of the multiple electrical terminals to detect a presence and the type of the external transducer device (3A, 3B), wherein the transducer device type detection circuit is further configured to detect a polarity of the microphone element included within the external transducer device (3A, 3B) by applying the voltage sequentially to the third terminal and the fourth terminal of the multiple electrical terminals and determining for which of the third terminal or the fourth terminal of the multiple electrical terminals the microphone element is forward biased by the applied voltage; and a configuration control circuit configured to alter a configuration of the integrated circuit according to the type of the external transducer device (3A, 3B) detected by the transducer device type detection circuit. an audio circuit configured to generate or receive at least one audio signal (hs1-hs4); multiple electrical terminals adapted to couple the audio circuit to an external transducer device (3A, 3B), the external transducer device (3A, 3B) being a headset in the form of a pair of earbud speakers (8A, 8B), one of which includes a microphone element, wherein the multiple electrical terminals include a first terminal and a second terminal configured for providing audio signals to the external transducer device (3A, 3B), a third terminal configured for connection to a first one of either a common return signal for the earbud speakers (8A, 8B) and the microphone element or a microphone output signal of the microphone element, and a fourth terminal configured for connection to the other one of either the common return signal for the earbud speakers (8A, 8B) and the microphone element or the microphone output signal of the microphone element; a transducer device type detection circuit configured to detect a type of the external transducer device (3A, 3B) when the external transducer device (3A, 3B) is coupled to the integrated circuit from characteristics measured at the multiple electrical terminals, wherein the transducer device type detection circuit includes a bias generator configured to generate a bias voltage for operation of the microphone element included within the external transducer device (3A, 3B) and during detection of the type of the external transducer device (3A, 3B) to apply a voltage to at least one of the multiple electrical terminals and a measurement circuit configured to determine whether or not the microphone element is forward biased by the applied voltage, wherein the transducer device type detection circuit is further configured to measure a voltage or current on the at least one of the multiple electrical terminals to detect a presence and the type of the external transducer device (3A, 3B), wherein the transducer device type detection circuit is further configured to detect a polarity of the microphone element included within the external transducer device (3A, 3B) by applying the voltage sequentially to the third terminal and the fourth terminal of the multiple electrical terminals and determining for which of the third terminal or the fourth terminal of the multiple electrical terminals the microphone element is forward biased by the applied voltage; and a configuration control circuit configured to alter a configuration of the integrated circuit according to the type of the external transducer device (3A, 3B) detected by the transducer device type detection circuit.