>>50891
Haven't read up on binaurals, but here are some more or less educated guesses, backed mostly by knowledge about audio engineering.
The brain mostly uses the difference in phase of an audio signal to resolve spacial information.
The perception of frequency is unaffected by this, although a few very sensitive listeners are able to hear differences in phase in some tests.
The use of different frequencies can create the illusion of a lower frequency for the auditory system.
This is were brain wave theory comes in, or more precisely the assumption, you could alter the brain wave frequency by specially prepared audio signals.
If such frequency change was to be inducible by these means, the usual headphones in combination with the human insensitivity to low frequencies effectively makes it impossible to even remotely get close to the frequencies, which are usually referenced, when talking about anything less than a state of high alertness.
https://hypertextbook.com/facts/2004/54m4nth4Charles.shtml
Binaural audio, as in stereo headphone audio with phase-accurate recording, is not completely bs, but the frequency brain wave talk most likely is just that.
Something else that might have some basis, could be multiple voices at different volume e.g. background audio, different virtual sound sources and so on. Anything, that might help to activate both halfes of the brain simultaneously.