I am designing a custom binaural sound recording rig, for my friends VR camera setup. He is recording live music, mostly acoustic performances and is looking for a more realistic headphone experience. He is currently using blue tooth capable Go Pro's. I would like to know if anyone has heard of a handheld recorder that will supply the proper bias voltage to the two "ear mounted" electret capsules, while being capable of transmitting the audio to the GoPro's, via blue tooth? It would be for syncing only, since the GoPro audio is pretty shabby.