I'm with you, I enjoy the sound of the bikes. But I had the waterproof case on the GoPro, so It muffles the sound a lot. (I had just returned from a hike with potential water crossing). And with the bouncy road, it was rattling pretty bad. PLus, speeding up the video makes the audio high pitch like the chipmunks. I'll play with the open back housing this weekend. I'll see if I can get some better audio next time.