Originally Posted by phaedrus56
I`m still not sure if the entrainment signal is the different rate heartbeats running through the recordings.
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It's one of the entrainment beats yes. I believe it's the binaural beats that are generated from the combination of frequencies of left and right headphones, so the sound isn't really there on the recording, but the combination of frequencies creates it in the brain.
As polly says, you can turn the volume really low and it will still work. You don't need to be able to consciously able to hear the beats for it to work as the brain will still pick up on the frequencies as needed.
Hugs
Giles