Hi. It's 24/48khz, which is what I've always used. My audio in the video is not clipping, so things look good there.

I've rendered to MAGIX AVC/AAC MP4, Internet HD 1080p 50fps. One thing I noticed, which was different than my usual process, is that Vegas didn't default to my normal rendering setting, which was 60fps. It suggested a different one with the "=" beside it. So, something is a bit off from my typical workflow.

Sorry, and yes, just a typical .wav file.

Could you double-check the project and render framerates and make sure they match?

Thanks, how do I do that?

If I'm understanding you correctly, here's the project info under the preview screen:

Project: 1920x1080x32 50.00p

Render just states: Internet HD 1080p 50 fps

Alt + enter opens the project properties window.
"Custom template" lets you change the render template to your desired framerate (and resolution, bitrate, etc.)

Please try a render now that the properties match each other.

I'm fiddling with render settings. I was able to create an MOV file, rather than MP4, and while I cannot view this on my Windows system, I was able to hear the audio and it was perfect -- no glitch at the beginning. So, just to confirm, there's something amiss with my render settings when creating an MP4.

@Rob-Leischner

Put the MOV file back on a Vegas Pro timeline and try to render. That will shed some light on render vs decode etc.

@john_dennis

I was able to place the MOV file on the timeline. Just so I'm understanding, you're suggesting I try to rend the MOV file as an MP4?

Okay, so the plot thickens. I decided to go ahead and upload the MOV to YouTube, thinking the glitch was fixed, but then when I played it back after upload, the same problem occurs. It cuts out the first second or two of audio, even though it's playing just fine in Vegas Pro.

What kind of mov file is it? ProRes? Can you state the exact steps you took to make this bug appear so we can try to replicate it?

Thanks to all for trying to help. I experimented with a mov file, just creating one out of desperation. It didn't help the issue, however. Working out of Windows, I'd really like to create an MP4. I've tried different ways of rendering the project settings (1920x1080x32 50fps), but it keeps coming out the same way. The first few seconds of the rendered video's audio is muffled/clipped, even though it's playing perfectly in preview.

Just as an experiment, try taking one of the .wav audio events into an audio editor like Sound Forge, Audacity or similar and save to a new file in 24/48K and then replace the original with the new render. After doing that, does that change the Vegas Pro render result?

I just tried this, thanks for the suggestion. Unfortunately, it yielded the same result.

Just out of curiosity, does Vegas have a setting in the rendering option that automatically adjusts the volume or compresses or whatever? If so, perhaps it's making the adjustment at the beginning of the video and causing the hiccup. I have no idea what else could be causing this, outside of a user error that I cannot discern.