Tool 13 · Grounding
Calm Sound Mixer
Four looping channels — brown noise, low hum, soft rain, slow waves — mixed on the fly. Designed to do one thing: change what your ears are doing while your head does the anxious thing.
Brown noise
Deeper than white noise. Like distant traffic or a warm room hum.
Low hum
A soft ~96Hz tone, useful for tinnitus masking and focus.
Soft rain
Filtered white noise — like rain on a window, not a deluge.
Slow waves
An amplitude-modulated brown noise — like slow breathing for your ears.
All sounds are generated live in your browser using the Web Audio API — no audio files, no streaming, no upload. Works offline once the page is loaded.
Why these four, and not "ocean waves"
Most ambient-sound sites load pre-recorded loops. That sounds nicer for a moment, but the loop seam becomes audible after 20 minutes and pulls you out. Every channel here is synthesised in real time, which means there's no loop. Brown noise and filtered noise are the ones with the best evidence for tinnitus masking and concentration; the low hum gives your brain something to "hold onto" if your mind is racing; slow waves are amplitude-modulated to mimic breathing.
Who it's for
People who can't sleep in silence but find "calming playlists" too busy. People trying to work next to a noisy household. People whose anxiety shows up at 2am and would rather not reach for a screen with notifications.
Not for everyone — some people find low hums distressing. If you have tinnitus that's worsened by noise, see an audiologist, not a website.
Reading the mix
There is no "right" mix. A useful experiment: start with brown noise around 30, then add one other channel at 20. Listen for two minutes. If something feels off, lower it — usually the thing you lowered wasn't actually helping. Most people end up with brown + one other, or low hum alone.
Limitations
It won't silence a panic attack. It won't replace noise-masking treatment for clinical tinnitus. And it is not binaural beats or "binaural sleep frequencies" — those have weaker evidence and are not what this tool does.
FAQ
Does it use any audio files?
No. Every sound is generated in your browser using oscillators and noise buffers. Open DevTools and look at the Network tab during playback — there are no audio requests.
Why no "ocean waves" option?
Real recorded waves have obvious loop seams and variable quality. Modulated brown noise gets the same psychological effect ("rhythmic whoosh") without the seam.
Sleep timer doesn't always stop everything on time — bug?
Browsers throttle timers on background tabs to save battery. The timer will run correctly as long as the tab is in the foreground.
How do I use Calm Sound Mixer step by step without mistakes?
Follow the order given in the usage section: A four-channel ambient sound mixer for focus, anxiety, or sleep. Built with Web Audio API — runs offline once loaded. The step-by-step part matters less than the unit check that sits inside it. Confirm every unit matches the thing you are actually trying to measure before you press calculate - that single check catches more wrong answers than any other habit, and it costs about ten seconds.What are the common mistakes when using Calm Sound Mixer?
Most common mistakes come down to four habits: entering 20 when the field expects 0.2 because the field is a percentage; leaving a field blank and accepting the default without checking what it stands for; changing one input and reading a result that was calculated before the change; and quoting the output as an exact figure when the page describes it as a reference estimate. Press calculate again after any edit, and treat the number as a reference point rather than a final answer.Advertisement