Experimental frequencies: sound choices, not medical promises

DeepMindSync places the carrier at the midpoint between two ear tones. A 728 Hz carrier with a 10 Hz beat sends 723 Hz to one ear and 733 Hz to the other; ear balance can swap the higher side. It does not play a single 728 Hz tone. Stereo headphones keep the two signals separate.

The beat-band label describes the frequency difference in the audio. The app does not measure brain activity. A measured auditory EEG response in a study is also not the same as demonstrating better sleep, concentration, or a clinical benefit.

A 2023 systematic review of 14 EEG studies found five supporting binaural-beat entrainment, eight with contradictory findings, and one with mixed results. A 2025 review of perioperative trials reported anxiety and pain benefits, but substantial variation between studies limits generalization to a particular app preset.

We did not locate convincing controlled human evidence establishing special health benefits from listening to 728, 727, 784, or 880 Hz. Their appearance in Rife-inspired or wellness lists does not establish that they remove pathogens, repair tissue, or treat disease.

Audible sound, electrical stimulation, electromagnetic fields, and medical ultrasound are different exposures. A frequency number cannot transfer a finding from one method to another. Cancer Research UK's assessment finds no reliable evidence for Rife machines as a cancer treatment; it does not validate headphone tones either.

The Experimental group pairs these carriers, plus a nearby 700 Hz comparison, with the same 10 Hz beat. These are optional sound-preference choices, not validated therapeutic doses. Nothing establishes that 728 Hz is better than a neighboring pitch.

Music tuned to A=432 Hz contains many notes; it is not a continuous 432 Hz tone. A 2020 randomized dental study of 42 participants found less anxiety with both 432- and 440-tuned music than with no music. It did not establish an anxiety advantage for 432 Hz. Its baseline-adjusted cortisol comparison also did not significantly distinguish the two tunings.

A frequently cited 2018 study involved nine people listening to five minutes of piano music on separate days. Its '528 Hz' condition used an A=444 Hz reference intended to include a note near 528 Hz. Reported stress-marker and mood changes are preliminary, not evidence that a pure 528 Hz tone repairs DNA.

A significant before/after result in one listening condition and a non-significant result in another do not automatically establish a significant difference between them. Neither study validates our centered-carrier binaural presets as equivalent interventions.

Researchers study 40 Hz clicks, amplitude modulation, binaural differences, and synchronized light-and-sound stimulation. These are not interchangeable. DeepMindSync's 340 Hz carrier / 40 Hz beat option plays continuous tones at 320 and 360 Hz. It adds no click train, background noise, or visual flicker.

A 2025 attention experiment reported benefits under some binaural-beat settings, including a 340 Hz carrier with a 40 Hz beat, but did not convincingly prevent declining performance over time. Background noise and other parameters mattered. Our 16 Hz and 40 Hz options are personal comparisons, not replications of that protocol or established focus treatments.

A 2024 randomized Alzheimer's study enrolled 76 participants using audiovisual stimulation. Its primary efficacy measure did not significantly separate treatment from sham, although some secondary outcomes showed nominal benefits. A 2025 two-year extension involved only five patients without a concurrent randomized control group. These findings remain investigational and cannot establish a benefit from this app.

Larger trials, such as HOPE, are important to follow. A completed study or a trial-registry entry is not itself a positive efficacy result. Consult the linked registry for subsequent results rather than treating this page as a live clinical update.

Schumann resonances are electromagnetic phenomena in the Earth-ionosphere cavity. An audio beat at 7.83 Hz does not recreate that exposure. A 2025 quasi-experimental study of 24 male referees reported EEG differences with 7.83 Hz stimulation, but no significant improvement in time perception or anticipation timing from that condition. It did not demonstrate a unique benefit over neighboring beat rates.

The Solfeggio carriers, golden-ratio sequences, and Silva-inspired stages in this catalog are tradition- or design-inspired listening choices. Their exact numbers and sequences are not clinically validated audio protocols. The catalog does not assign tissue repair, detoxification, or other medical effects to them.

When comparing carriers, keep the beat rate, volume, duration, headphones, and ear-balance settings consistent. When comparing beat rates, keep the carrier fixed. Change one parameter at a time and vary the order across separate listening sessions. This is a personal comparison, not a blinded clinical trial.

Optional session-response check-ins record how you feel. They cannot establish entrainment, causation, or a medical effect. Preference, expectation, fatigue, environment, and normal day-to-day variation can influence the result.

Keep the volume comfortably low and take breaks. The volume percentage and gain ceiling are not calibrated sound-pressure measurements and cannot guarantee hearing safety. Stop for discomfort, ringing, or dizziness. Do not listen while driving or use these presets to replace or delay medical care.