[samarudge]

Paranoia much? Surely a much better approach to security would be network monitoring, anti-virus and vigilance. This sounds like blacking out the windows because you can't be bothered to close the curtains.

If your tin-hat doesn't feel like enough protection, try downloading and installing Sound Flower (Generally cool app). Basically it lets you 'patch' one audio output on the computer to an audio input, so you could record the output of your computers speakers at near full resolution (Useful for screen-casts/video game play through and probably lots of other things). Activate Sound Flower Bed and select the option along the lines of 'no input'/'no device'. Go into system preferences and select the Sound Flower device as the default input device.

All of that is, however, completely irrelevant since applications can select audio inputs external to system preferences and record the input at whatever volume they like. (E.G. Skype can use a different input to the sys default, Logic Pro can record from all you system inputs at once etc.)