Audio deteriorates with time

[driley]

I am making a twenty minute video to submit as a demo.  When I play it back the video is great, the audio starts out great but by ten minutes a bonging sound begins - by 14 minutes I sound like I am underwater.  I have turned my speakers way down.  Any suggestions?

[Ray_Harwood]

A variety of things can cause sound to degrade over time – though in most cases this doesn't happen, of course. A lot depends on your audio settings.

Any chance you can grab a screen shot of your Zoom Settings Audio tab and post?  Also might be helpful to know what kind of mic you are using (brand and model if possible), and if you are using any sound applications for compression, equalization, noise reduction, etc.