Later installments of the Jackpot Series embed carrier frequencies (usually between 80Hz and 250Hz) with binaural offsets (Delta/Theta ranges). If the audio is re-encoded poorly, the phase cancellation destroys the binaural effect. To get the "brain massage" effect, you need the original phase-accurate encoding.
Sites like Last.fm catalog the tracks and often link to authorized storefronts. isabellavalentinejackpotseries high quality
The Production History of the Isabella Valentine Series In the specialized field of digital hypnotherapy and guided meditation from the mid-2010s, Isabella Valentine Later installments of the Jackpot Series embed carrier