Reducing volume on screencasts

I am inserting Screenr screencasts into my Presenter training. I need to display these screencasts in a separate browser window  due to the detail of the content which is lost in small screen. The audio for these demos is significantly louder than the audio in the PPT presentation portion of the training. If I use Video Encoder to edit the volume f the screencast, the output is a small screen where you cannot adequately view content. Any suggestions? 

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