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40 Hz for One Hour

by snwv

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40 Hz tones, each for one hour: sine, triangle, and pulse.

A study published in 2016 suggests that 40-Hz periodic input to the brain may stimulate neural housekeeping routines, flushing out of amyloid-β and other harmful compounds. While the study was done with periodic light input, another study suggests that sound may have the same effect.

Each track is nothing but an hour of straight-up 40 Hertz input for your ears and brain. The initial release in 2018 was just the sine wave track, but there are playback systems that have difficulty rendering that...and some articles on these studies mention that they used pulse waves, so I've added both triangle waves and pulse wave versions, which should be more audible on more systems. (The pulse wave is low-pass filtered with a 640 Hz cutoff, 0% resonance, to filter out harsher high frequencies.)

I do not make any promises or any guarantees regarding therapeutic results from listening to this. Use at your own risk. Please observe safe listening levels with all of these pieces, particularly with the pulse wave--you want to be able to keep using your ears.

Links to the studies:




released January 5, 2018

Max/MSP oscillator: Maurice Rickard


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snwv Pittsburgh

Maurice Rickard is a musician, sound artist, and Deep Listening Certificate holder based in Pittsburgh. snwv is his project to create ambient environments from finely tuned oscillators and other sound sources as well (guitar, microphones, feedback). Some patches use mostly oscillators, some use delays, some use controlled amounts of randomness. Results range from gentle ambience to chaos. ... more

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