1. A method for providing augmented audio to a listener wearing a headset including right and left ear speakers, comprising: with binaural microphones on the headset, capturing ambient sound in an environment about the headset; from a sensor array worn or carried by the listener, receiving a trigger signal; with a track selection module, selecting an augmentation audio track in response to the trigger signal; with a processor running an augmented reality (AR) audio mixer, combining the captured ambient sound with the selected augmentation audio track to generate an AR audio output track; and playing the AR audio output track with the right and left ear speakers of the headset, wherein the selected augmentation audio track has binaural characteristics associated with a virtual speaker located relative to the listener's headset in the environment.