Sony Handycam DCR-DVD 108 Audio problem

I recently purchased this camera because I needed a good, easy-to-use video camera to record live performances in small venues etc. I also need to be able to create using video that I import to my computer. The issue I am having with this camcorder is that there is no way to turn off the mic when recording so you always have the background sound. While this is not a problem when I'm recording a singer/songwriter live, it IS a problem when I just want video. Some models have an exterior mic plug so you can plug it in and turn the switch off as a work-around. This model doesn't have that feature. I thought I'd be able to remove the sound once I imported the video to my computer. Can anyone tell me if that should work/will work/can work? Also, the zoom in/out makes its own noise which also gets recorded in my videos. Any way to get rid of that?
Thanks for any help you can provide.
Karyn
 
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