This reminds me of the binaural beat technique (https://en.wikipedia.org/wiki/Hemi-Sync) that the Monroe Institute has been claiming for decades is a way to induce out of body like experiences.
That brings me back. I played around with Hemi-Sync stuff back in 2007 during my freshman year of college. I never got much out of it, and determined it was bullshit.
13 years later, I'm probably somewhat more open to the idea, after spending a decent amount of time meditating and experimenting with a few psychedelics. (Not in a mystical sense, just in a "maybe sound can help induce certain altered states of consciousness".)
Now that I have some meditation experience I kind of want to go back and experiment with binaural beats again.
I had some pretty interesting experiences with i-doser around that time.
A lot were fairly humdrum but there was this one time that was incredibly intense and it made me feel as if I had died. I was afraid of ever doing that one again. It left a lasting impression on me that entrainment definitely is a thing.
Might be fun for you to check out what https://www.brain.fm/science is doing, which takes an alternative approach focusing on generating rhythm and tone tracks that, for lack of a more detailed term 'lull' your brain into focused or relaxed states. I get a lot of mileage out of it when working, don't often use it for relaxation because I find simple nature tracks better for doing standing meditation.
