Don't take this the wrong way but did you adjust the volume on the Contour docking software? My roam had a mic gain adjustment. I run it at about 45/50 and it works fine... Lots of wind noise while boarding but it works.
Latest firmware on it of course.
Actually I sold my roam in the fall because the Roam 2 and Plus 2 were coming out, going to wait a bit for prices to drop and then buy one again. I used it snowboarding, snorkelling, etc. it was a good camera.
Just got the roam2 for christmas, sounded a little muffled for the first couple test videos, adjusted the mic sensativity and it sounds great now.