That's a pickle. And what abt white noise? I know a lot of therapists use this machine[1] to maintain privacy--sort of a similar goal
[1]: https://www.amazon.com/Marpac-Classic-White-Noise-Machine/dp...
[1]: https://www.amazon.com/Marpac-Classic-White-Noise-Machine/dp...
Sadly, my kids' sound spectra don't really fit that profile :)