Review This Crazy World

That camcorder does not have a mic input even though the link you included says it does.

See this link:

You cannot connect a mic. The best way to get good sound from any camera is to get the camera as close to the source of the sound as possible and try your best to eliminate all outside unwanted sounds. Your camcorder will not record loud sounds well.

If there is no mic input, there is no mic input. You can either replace the camcorder with one that has a mic jack or you can keep using that camcorder and get a field recorder - they capture audio only. See the units from Zoom, Marantz, Edirol, Sony, Tascam, M-Audio and others. When you edit the video import the audio from the field recorder, sync the audio, then mute the audio that was captured by the video. You need to use their manual audio controls.

If you are recording loud audio and it sounds muddy, that is because the camcorder’s built-in auto gain control cannot handle the loud audio. If that camcorder did have a mic jack and you plugged the best mic available into it and continued to use auto mic gain, it would still sound bad. You need to move to manual audio control.

If you are recording really soft audio, you need to get the mic (and the camcorder in your case) closer to the audio source.

The least expensive camcorders with manual audio control are the Canon HV30 and the Sony HDR-HC9 - they both happen to have a mic jack, too.

Just getting a mic is not the whole resolution - the better fix is the manual audio control.