Never used Sony Vegas but I'd be surprised if you can't adjust the volume of the audio some how.
I needed to boost the audio on the voice recording I did for a Borderlands 2 playthrough. I just loaded the recorded Mumble audio into Audacity (Link) and used the Enhancement menu to boost the volume up and then added it to my video
I usually boost the narration to be slightly louder than the game audio if I'm doing voice over.
I needed to boost the audio on the voice recording I did for a Borderlands 2 playthrough. I just loaded the recorded Mumble audio into Audacity (Link) and used the Enhancement menu to boost the volume up and then added it to my video

I usually boost the narration to be slightly louder than the game audio if I'm doing voice over.
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