There are multiple known examples of running code which does soundcard communication - see e.g. https://github.com/borismus/sonicnet.js. I can personally verify that it required no special handling to work on two laptops made by different manufacturers running different operating systems in a noisy room.

This doesn't mean that BadBIOS is true — only that it's annoying and tedious to play the skeptic with shoddy logic and trust-me assertions being presented as facts.

Can you describe your setup when doing this? It's also annoying and irritating having half the comment ignored. Don't care about the testimony unless it's backed up.

1. Open http://borismus.github.io/sonicnet.js/emoticons on Dell 2. Open http://borismus.github.io/sonicnet.js/emoticons on MacBook Air 3. Click on an emoticon 4. Observe the corresponding icon appear on the other system across the room

I made no changes, didn't turn off the music my phone was playing to a bluetooth speaker, etc. This is using the built-in speakers & mics at unadjusted volume levels – the only change I made was unmuting one of the two laptops.