My experience with similar recording uses an external mike. I mounted a small dv camcorder on my motorcycle helmet and run the external mike to directly behind the ferring. The sound is about like the rider usually hears, wind and motor sounds, quite realistic. Without the external mike the 80MPH wind noise masks out everything else. Be sure to cover the mike with a foam rubber shield. You are probably looking at a mike right there on your computer that does a fair job, and certainly within anyone's budget.