A system can comprise a radio unit comprising a digital front end, wherein the digital front end comprises a group of tap points that are configured to receive a first custom signal. The system can also comprise a first component that is configured to originate the first custom signal. The system can also comprise a second component that is configured to select a first tap point of the group of tap points, and inject the first custom signal into the first tap point.

A media system comprises one or more non-wearable playback devices, a gateway device, and a wearable playback device. The one or more non-wearable playback devices are configured to receive media content and to play the media content in synchrony with one another. The gateway device is commutatively coupled with at least one of the non-wearable playback devices and is configured to receive the media content. The wearable playback device comprises a microphone and a transducer and is commutatively coupled to the gateway device. The wearable playback device is configured to receive the media content and to simultaneously play ambient audio received via the microphone and the media content via the transducer while the one or more non-wearable playback devices play the media content.

A media system comprises one or more non-wearable playback devices, a gateway device, and a wearable playback device. The one or more non-wearable playback devices are configured to receive media content and to play the media content in synchrony with one another. The gateway device is commutatively coupled with at least one of the non-wearable playback devices and is configured to receive the media content. The wearable playback device comprises a microphone and a transducer and is commutatively coupled to the gateway device. The wearable playback device is configured to receive the media content and to simultaneously play ambient audio received via the microphone and the media content via the transducer while the one or more non-wearable playback devices play the media content.