How this actually works
48 guides to brainwave audio — what the bands are, how the synthesis works, and where the evidence is strong, contested or absent. Written to be checkable rather than persuasive, and consistent with the science page.
Binaural, isochronic and monaural beats
The same 10 Hz rhythm can be built three ways. Only one of them survives a speaker.
Read the guideChoosing
Which method, which mode, which hardware — and what actually distinguishes them.
- Binaural, isochronic and monaural beatsThe same 10 Hz rhythm can be built three ways. Only one of them survives a speaker.
- Headphones or speakers?Most of this catalog works on a kitchen speaker. One mode cannot work on one at all.
- Beats or noise for focus?They solve different problems. Most people reach for the wrong one.
- Why generated audio beats a loopA loop teaches you its length. After twenty minutes you are listening to the seam.
- Noise cancelling or open-back?Cancellation is not neutral. It removes the low end of a room and leaves the rest.
- Does Bluetooth ruin a session?Latency is irrelevant here. One much less discussed thing genuinely is not.
- Music or non-musical sound?The question is not whether you like it. It is whether it is asking for the attention you need.
- Sound masking or silence?A quieter room is not the goal. A less informative one is.
The bands
Delta through gamma: what each range is associated with, and how firmly.
- Brainwave frequency bands chartEight frequency ranges, one interactive chart, and the distinction that keeps the labels honest.
- Delta waves (0.5–4 Hz)The band of deep sleep — and the one where timing matters more than frequency.
- Theta waves (4–8 Hz)The threshold state: not quite awake, not asleep, and unusually good at making connections.
- Alpha waves (8–12 Hz)The first brain rhythm ever recorded, and still the most reliable one to elicit.
- Beta and SMR (12–30 Hz)Faster is not more focused. Past a point, faster is just anxious.
- Gamma and the 40 Hz questionReal laboratory findings, real clinical trials — and a gap between those and an audio track that is worth being honest about.
In practice
Sleep, focus, study, recovery — how to use this well, including when not to.
- Using sound to fall asleepThe evidence says timing matters more than frequency. Most bedtime routines get it backwards.
- Sound for deep workThe session that helps is the one that ends. An endless stream becomes wallpaper.
- Audio for anxietyThe strongest evidence in this field is for anxiety. It is also where expectation does the most work.
- Sound for creative workFocus audio helps you execute. It is actively unhelpful when you do not yet know what you are making.
- Audio for studying and memoryThe best evidence here is about sleep after studying — not about sound while you study.
- Sound and the power napThe difference between a good nap and a ruined afternoon is about ten minutes.
- Sound for reading and comprehensionThe clearest rule in this entire field: no words while you are working with words.
- Audio for programmingDebugging is not deep work. It wants a different band and a shorter session.
- Audio for meditation practiceA session is scaffolding. If it becomes the practice, the practice has gone.
- Tinnitus and sound maskingSound can make tinnitus less prominent. That is a real and limited claim, and it is the honest one.
- Jet lag and travel audioSound will not move your circadian phase. Light will. Both still have a place on the trip.
- Shift work and irregular sleepThe hardest sleep problem there is, and the one where audio is most obviously a partial answer.
- The 40 Hz gamma protocolHow to actually run a 40 Hz session — and why binaural is the worst way to deliver one.
- SMR, beta and the ADHD brainThe evidence here is real — but it is for neurofeedback, which is not what an audio track does.
- Audio and flow stateFlow is a state of selective shutdown, not maximum effort. That changes what you should play.
- Hypnagogia and lucid dreamingThe edge of sleep is genuinely strange and genuinely useful. It is also heavily oversold.
- The vagus nerve, HRV and slow breathingThe best-evidenced thing on this whole site is not a frequency. It is a breathing rate.
- Brainwave frequency stackingFive bands across a day, matched to how alertness actually moves — and stripped of the invented laws.
How it works
Carriers, envelopes, noise beds and the synthesis behind every session.
- What modulation depth changesRate decides what the rhythm is. Depth decides how much you notice it.
- Stereo width and the slow orbitA very slow pan is the cheapest way to stop a steady field becoming furniture.
- Does audio quality matter here?Nothing is being compressed, because nothing is being transmitted. That changes the question.
- How loud should a session be?The one genuine, well-evidenced risk in this whole category — and the one nobody markets.
- White, pink, brown and violet noiseFour slopes, four characters. The differences are precise, not poetic.
- What the carrier actually doesThe number in the session name is usually not the number you hear.
- Why the shape of a pulse mattersSame rate, same carrier, entirely different experience. The difference is the edge.
- The endlessly falling toneA pitch that falls forever without ever getting lower. And a practical use for it.
Straight answers
The claims this industry makes, checked against the evidence.
- Closed-loop vs open-loop audioThis is the distinction that explains why the research looks better than the products.
- Do binaural beats actually work?Three different claims get sold as one. They have very different amounts of evidence behind them.
- 432 Hz and the solfeggio mythThe numbers are modern, the history is fabricated, and the effect people report is real but has another explanation.
- Are binaural beats safe?For most people the honest answer is boring. For a few, it is a real conversation with a doctor.
- What "entrainment" actually meansA precise term borrowed by an imprecise industry. Worth knowing which one you are being sold.
- Why the EEG studies disagreeThe literature is genuinely messy. Knowing why makes it much easier to read.
- Does it only work because I expect it to?A fair question, an uncomfortable answer, and a reason it might matter less than you think.
- The "digital drugs" mythNo audio file reproduces a pharmacological effect. The interesting part is why so many people report one.
All 777 sessions publish their full signal specification, so anything described here can be checked against what actually plays. Browse the library.