Can I disable the audio preview during capture? A simple thing but I have looked all over for it.

 Not sure what you mean by "disable the audio preview" but if you don't want the audio tracks, just disable the audio track buttons on the capture tool. If you want the audio captured but don't want to listen to it while it's capturing, just mute your monitors.

Hey Thanks Mr. Rubin. I wanted to mute the video while previewing and I couldn't understand why the monitors wouldn;t mute.... then I realized I has switched the sound card to use window's audio control. So I changed that and it solved my issue. Thanks again for all your help.

 You're very welcome, and please call me Larry. We're all very informal here.