Found: Fuser Mixes Ambient Sounds with Your Music for Safer Headphone Use
The video may look a little like an infomercial, but the idea is interesting. Riding safely with headphones is a problem lots of companies have been trying to solve. Some by circumventing the noise cancelling aspect of headphones (see Aftershokz, for example) others by turning your helmet into a veritable modern day boombox (see Freewheelin, for example). Fuser by Olens Technology, on the other hand, adds a microphone to your existing headphones that picks up the noise around you and plays it through your headphones along with your music, audiobook, podcast, etc. with volume control and a mute button. No word on interference or what the mic sounds like with wind whipping across it, but the idea could have potential.