I don't know about beta version (does it even exist?), but everything I could find on YouTube that doesn't contain creepy pictures sounds fine to me. I'm pretty sure some people experience headaches only because they made themselves do that, it's like placebo effect. I guess it's fake (like 99% of other creepypasta). My headphones aren't bad, I can hear stuff that people with worse headphones can't hear (especially enemies on the other side of the map in CS:GO), so I would know if there were something weird with sound.
P.S. What's actually creepy is that it shows 2 pages in this thread, but I can see only one...