[Ryan Higgins]

I was having the same problem using Vegas HD Movie Studio Platinum 11. Changing the audio sample rate when rendering, to what the audio track was already at helped to keep my levels level (I was using audio that I had brought in from REAPER). To do this go to Customize template>>Audio>> go to the Sample Rate dropdown. Vegas had mine set at 48,000 Hz. I changed it to 44,100 Hz (which I think is the standard rate for recordings, at least music recordings). If that doesn’t work, IDK maybe contact Sony. You can always bump up the volume a little as well to make up for the drop as a temporary fix. Hope this helps.