A:Answer Hello,
Typically, when you want good sound you want to use separate audio, anyway.
It might seem like a pain at first but, you get used to it pretty quickly.
Download a free audio recording software (coughcoughAudacitycough) onto your PC/laptop and record there while recording video, separately, with your camera.
Then, you can clean up your audio before synching it to your video in a free video editing software (coughVSDCcough).
(Mute any audio that was picked up by your onboard camera mic)
Here's a tip: Roll video and audio - then clap your hands a couple times in view of the camera before starting your introduction. Just like the clappers you see in 'behind the scenes' video of movies it'll help you synch your audio.
You'll also have the bonus of being able to do clean voiceovers and narrations while you show shorter clips of video.