Is there anyway to improve the sound captured with the internal mic on the Drift HD170? It records shocks to the camera well, and things bouncing off of my helmet, but doesn't capture the sound of the biking rolling or voices too well. I know there's a relatively inexpensive external mic and rear hatch seal available, but is there a way to just improve the onboard mic? Turning up the sensitivity doesn't quite work? Is there a spot on the rubber housing I can modify/cut open to expose the mic?