Advice on how to get a clear sound recodinf with my camcorder?

[Adelleda]

I want advice on where to please the amp, volume, settings, that kind of things, all that you can contribute will be greatly appreciated.
My camera is a SDR-H80

[paul_wolfe]

Does your camcorder have a sound in option (ie can you plug in an external microphone for example) or can you only record on the camera's built in microphone?