IMPORTANT UPDATE: The comments on YouTube say this audio makes tinnitus worse. Be cautious.
Update II: I read that the frequency of that 40 HZ tone (they modulated a high frequency at 40 HZ) was selected based on the hearing range of the mice in the study. Therefore I quit using that audio file and just make my own 40 HZ tones. Let me know if I can help with anything.
Exact 40 Hz Gamma Brainwave audio used by MIT to prevent Alzheimer’s youtu.be/UVne_84qZkA
Somebody on HU shared this with me.