The Otto tuners are used for relaxation, as the sound vibrates into the bones and releases tension.

The Otto Tuners are tuned to the frequencies of 32cps, 64cps and 128cps.

They vibrate at a low pitch and due to their weighted ends, the sound lasts longer than that of regular tuning forks. Their frequencies are based on an 8 cps fundamental tone raised in octaves (i.e. 8 cps, 16 cps, 32 cps, 64 cps, 128 cps.) The 8 cps fundamental, which based on the pulsation of the planet earth, is the generating tone for all our tuning forks. The 128 Otto Tuner is especially effective when placed on the rib heads, thoracic vertebra, sternum and ileums.

Two Otto Tuners tapped gently on the knees and held to the ears create a beautiful sustained low tone, which is excellent for grounding and relaxation.

The 64 Otto Tuner is especially effective when placed on the lower lumbar vertebrae, sacrum and coccyx. Its vibration helps loosen the sacral ligaments as well as stimulating and balancing the ganglion of impar, a center for controlling the balance between the sympathetic and parasympathetic nervous system.

The 32 Otto Tuner works with your skin and hair to stimulate nerves. Otto Tuners are available in three Different Frequencies: 32, 64 and 128 Hz. It is recommended to start with the Otto 128.

Instructions

For using the 128 and 64 Otto Tuners with bones and ligament, hold the forks by the stem and gently tap them on your knee. With the finger or thumb of your free hand locate the spot on the body where you want to place the tuning fork. Press the end of the stem of the tuning fork onto the spot. Make a firm contact and hold the tuning fork until you feel the vibrations stop. For listening, hold the 128 Otto Tuner by the stem and gently tap the weights on your knees or tapping pad. Bring the tuning fork(s) to your ears and adjust the distance by tone. Hold one fork about an inch from your left ear and one an inch from to the right ear. This creates a long sustained pitch. This works well with the 128 Otto. The 64 and 32 Otto may also be used in this manner. When tapping the 64 Otto and 32 Otto, gently tap the body (the weighted portion) of the tuning fork on your palm. This will set the weights in motion and create a pure tone. The 32 Otto is especially effective for stimulating nerves on the skin and hair. Tap it by the body as described and than lightly touch your skin or hair with the edge of the tuning fork body. You will fell it stimulate, vibrate, and "tug" at your skin and hair. You can also tap the fork and move it very slowly across an area just above your skin without touching.

The set of 3 includes a free activator and velvet storage pouch.

About our Tuning Forks

Our tuning forks are made from a special Aluminum Alloy that is heat treated giving them a very pure tone. The single fundamental frequency will remain constant for up to 15-20 years and the non-tarnishing material will not rust or corrode. Each fork is tuned by hand to an accuracy of /- 0.25% or better.

Please do not confuse our tuning forks with inferior products being made in China and Pakistan.

DnA Repair 528 Hz. Tuning Fork is Our MOST POPULAR selling single fork! Great for those just getting started with Tuning forks!

The DNA Repair 528 Hz Tuning Fork is a powerful tool to have in sound therapy. Able to produce the same frequency used by genetic engineers to repair the DNA, this 528 Hz tuning fork is perfect to use when you want to improve your overall level of wellbeing using the subtle healing power of sound.

Producing the third note of the original 6 Sacred Solfeggio, this tuning fork offers a sound of 528 Hz or "Mi", representing "Miracles". Genetic engineers have used this frequency in DNA repair, which is anchored by a healthy core of a six-sided crystal of structured water.
Made from high-grade aluminum, this 528 Hz tuning fork offers durable and dependable sound production so that you can utilize it often as part of your sound therapy regimen. It is tuned with care, ensuring that the correct tone is produced accurately and in a manner that is longer and stronger than comparable forks made of stainless steel. Subtle overtones are produced using the high levels of vibration, making it an essential tool for healing and meditation.
This fork is from the Solfeggio Set, and is available un-weighted only. Measures 6 1/2" long, with a 2" long stem. Ships in a protective bag so it doesn't get scratched.

Add the Book of 528 and save. Provides the science and math demonstrating that 528 Hz is the frequency of love and healing. The instructions in this book by Dr. Len Horowitz will help amplify your spiritual connection to love/healing. SAVE 10% when ordering the 528 Book and Fork Combo.

About our Tuning Forks

Our tuning forks are made from a special Aluminum Alloy that is heat treated giving them a very pure tone. The single fundamental frequency will remain constant for up to 15-20 years and the non-tarnishing material will not rust or corrode. Each fork is tuned by hand to an accuracy of /- 0.25% or better.

Please do not confuse our tuning forks with inferior products being made in China and Pakistan. ALL our tuning forks are made in the USA.

View other popular Tuning Forks HERE.

Your brain has a natural ability to shift states — from anxious to calm, foggy to focused, wired to rested. The DAVID Delight makes that shift effortless.

Using Audio-Visual Entrainment (AVE) — a clinically researched technology combining pulsed light and rhythmic sound — the Delight gently guides your brainwaves into the state you need most. Whether you want to energize your morning, sharpen your thinking, settle anxious thoughts, or drift into deep sleep, there's a session designed for that. No pills. No screens. Just science-backed light and sound therapy in the palm of your hand.

Key Benefits

•       Reduce stress and quiet a racing mind

•       Fall asleep faster and sleep more deeply

•       Boost focus, memory, and mental clarity

•       Elevate mood and ease anxiety

•       Increase daily energy — without caffeine

•       Support overall brain health through increased cerebral blood flow and natural neurotransmitter production

Backed by research in: Seasonal Affective Disorder, insomnia, stress reduction, cognitive performance in students and seniors, mood regulation, and balance improvement.

What Is Audio-Visual Entrainment?

Audio-Visual Entrainment (AVE) uses precisely timed pulses of light and sound to "entrain" your brainwaves — guiding them toward a target frequency associated with a specific mental state.

10 Preset Sessions

Two sessions per category, so you can choose by depth, duration, or need.

Each category also includes a Sound Sync session that transforms your own music into a personalized light show.

Technology & Features

Tru-Vu Omniscreen Eyeset Glasses

The patented Tru-Vu Omniscreen design uses 8 blue-tinted white LEDs mounted over a silver reflector behind a translucent screen — dispersing light evenly and safely across both visual fields. Uniquely, it can stimulate each hemisphere of the brain at a different frequency simultaneously, enabling independent left-brain/right-brain entrainment for superior mood and cognitive results.

Three Audio Entrainment Modes

•       Isochronic Pulsed Tones — evenly spaced, equal-pitch pulses for maximum entrainment effectiveness

•       Monaural Beats — smoother, gentler pulses ideal for those sensitive to sharp tones

•       Binaural Beats — two pure tones (one per ear) create a perceived beat for deep brainwave guidance

Heart Rate Variability (HRV) Paced Breathing

Every session begins with guided HRV breathing — a clinically validated technique for calming the autonomic nervous system. The Delight paces your inhale and exhale cycles through audible heartbeat cues, helping to settle both sympathetic (fight-or-flight) and parasympathetic stress responses. You breathe in sync with the device, supporting deeper relaxation and faster session onset.

Proprietary Randomization Process

The Delight's randomization technology enhances dissociation — your brain's ability to "let go" and track the entrainment stimulus — resulting in more effective and consistent brainwave guidance session after session.

Soft-Off Fade Technology

Sessions end with a gradual dimming of lights and tones, preventing startle response (somatic shock) and preserving the calming benefits even after the session completes.

User-Friendly Design

•       Night-vue illuminated buttons — visible in the dark for bedtime use

•       Raised tactile power, intensity, and volume buttons — easy to adjust without opening your eyes

•       Battery power indicator — glance-and-go readiness check

•       9-volt battery powered — extended life with new eyeset technology

What's Included

Who Is the DAVID Delight For?

•       Anyone seeking a non-pharmaceutical approach to stress, sleep, or mood support

•       Professionals managing mental fatigue, burnout, or focus challenges

•       Students looking to sharpen concentration and memory

•       Seniors interested in balance improvement and cognitive maintenance

•       Wellness enthusiasts wanting to deepen meditation practice

•       Those with Seasonal Affective Disorder (SAD) seeking light-based support

•       First-time AVE users looking for an accessible, research-backed entry point

•       10 RESEARCH-BACKED SESSIONS — Two sessions each for Energize, Meditate, Brain Booster, Sleep, and Mood Booster, all supported by current clinical studies

•       PATENTED TRU-VU OMNISCREEN GLASSES — Stimulates each brain hemisphere independently at different frequencies for superior mood and cognitive enhancement

•       3 AUDIO ENTRAINMENT MODES — Isochronic tones, monaural beats, and binaural beats for customized brainwave guidance

•       HRV GUIDED BREATHING — Clinically validated heart rate variability breathing built into every session for deeper autonomic nervous system calming

•       NIGHT-VUE BEDTIME READY — Illuminated buttons visible in the dark; Soft-Off fade prevents sleep disruption at session end

•       OPTIONAL SESSION EDITOR SOFTWARE — Design, customize, and download your own AVE sessions for fully personalized brainwave training

The DAVID Delight Pro is the first device in the Delight family to combine two clinically researched technologies: Audio-Visual Entrainment (AVE) and Cranio-Electro Stimulation (CES). Use them together for maximum effect, or independently — you're in control.

With 25 sessions spanning the full range of mental states — plus 3 advanced gamma protocols — the Delight Pro is built for those who want a serious, science-backed brain wellness tool. Whether you're managing chronic stress, optimizing cognitive performance, or seeking deep sleep support, the Pro delivers precision where it counts.

Key Benefits

•       Dual-modality brain stimulation — AVE and CES work independently or together

•       CES increases cerebral blood flow and stimulates serotonin, endorphins, and norepinephrine

•       25 sessions across 5 categories plus 3 gamma protocols for complete coverage

•       CES follows the AVE session frequency — or select the popular standalone 100 Hz CES mode

•       Non-pharmaceutical support for stress, sleep, mood, focus, and cognitive health

•       Backed by research including performance optimization for academic, sports, and business contexts

25 Preset Sessions

What Is Cranio-Electro Stimulation (CES)?

CES is a non-invasive brain stimulation technique that delivers a small, precisely calibrated pulsed electrical current across the cranium. Applied via ear clip electrodes, this gentle microcurrent stimulates the production of key neurotransmitters — serotonin, endorphins, and norepinephrine — and increases cerebral blood flow, supporting mood regulation, pain relief, stress reduction, and mental clarity.

On the Delight Pro, CES frequency automatically follows the active AVE session for synchronized dual-modality entrainment. Alternatively, select the standalone 100 Hz CES mode — a popular choice for its broad relaxation and neurotransmitter benefits.

The Gamma Sessions

•       SMR/Gamma — cycles between 40 Hz and 12–15 Hz SMR to calm the body while boosting mental sharpness

•       Randomized 38–42 Hz — natural-feeling gamma entrainment using proprietary randomization

•       Fixed 40 Hz — based on research showing increased cytokine production and amyloid reduction in animal studies

What's Included

•       AVE + CES DUAL STIMULATION — Combine Audio-Visual Entrainment and Cranio-Electro Stimulation for powerful, synergistic brain wellness support

•       25 SESSIONS + 3 GAMMA PROTOCOLS — Comprehensive coverage from deep sleep to peak cognitive performance, including advanced 40 Hz gamma therapy

•       CES SYNCS TO AVE FREQUENCY — Or choose standalone 100 Hz CES mode for targeted neurotransmitter and cerebral blood flow support

•       RESEARCH-BACKED FOR PERFORMANCE — Sessions supported by studies in stress, sleep, SAD, cognitive function, and academic/sports/business optimization

•       NON-PHARMACEUTICAL BRAIN HEALTH — Drug-free stimulation of serotonin, endorphins, and norepinephrine via both AVE and CES pathways

•       PORTABLE & POWERFUL — Hand-held device with tactile controls, battery power, and optional Session Editor software for full customization

Learn More about Light and Sound and Mind Machines Glossary of Light and Sound Terms Light and Sound Medical Disclaimer

The DAVID Delight Plus is the most complete Audio-Visual Entrainment device in the Delight family — 28 active entrainment sessions, 5 Sound Sync programs, and three dedicated gamma protocols at 40 Hz, the frequency at the center of today's most compelling brain health research. If you've outgrown the base Delight or you're starting with serious intent, this is the device.

Built by Mind Alive Inc. — the pioneer of clinical audio-visual entrainment with over 30 years of published research — the Delight Plus uses precisely timed pulses of light and sound to guide your brain into any state you choose: deep sleep, sharp focus, emotional calm, or elevated mood. No pharmaceuticals. No side effects. No effort beyond putting on the glasses and pressing play.

Key Benefits

• 28 research-backed AVE sessions plus 5 Sound Sync programs — 33 total
• Increases cerebral blood flow and stimulates natural production of serotonin, norepinephrine, and endorphins
• Drug-free, non-habit-forming support for sleep, mood, focus, and cognitive health
• 3 dedicated gamma (40 Hz) protocols — exclusive to the Plus and Pro models
• Proprietary randomization enhances dissociation and brainwave tracking vs. fixed-frequency devices
• Compatible with optional Multi-Color Tru-Vu Eyeset and downloadable Session Editor Software
• Backed by peer-reviewed research in insomnia, SAD, cognitive performance, stress reduction, and senior balance

What Is Audio-Visual Entrainment (AVE)?

AVE uses precisely timed pulses of light (via the Tru-Vu Omniscreen glasses) and sound (via stereo headphones) to guide your brainwaves toward a target frequency — triggering the brain's natural "frequency following response." Choose your session, choose your state.

28 Sessions + 5 Sound Sync

Five sessions per category gives you meaningful choice — different depths, different approaches to the same goal. Gamma sessions are exclusive to the Plus and Pro models.

The Gamma Advantage — Exclusive to the Plus & Pro

Gamma brainwaves (30–100 Hz) are the brain's highest-frequency activity. At 40 Hz — the gamma master clock — neural networks synchronize across regions, binding sensory input into coherent perception and supporting the highest-order cognitive functions. The Plus is the only Delight model that takes you there with three distinct protocols.

• SMR/Gamma — Cycles between 40 Hz and 12–15 Hz (SMR) to calm the body while sharpening mental focus simultaneously
• Randomized 38–42 Hz — A varied gamma approach using Mind Alive's proprietary randomization for more natural-feeling entrainment
• Fixed 40 Hz — The protocol linked in research to beneficial cytokine production and, in Alzheimer's animal models, dramatic reduction of amyloid deposits

Research context: Singer et al. (Georgia Tech) found 40 Hz AVE produced beneficial cytokines in healthy subjects. Tsai et al. demonstrated gamma stimulation dramatically reduced amyloid deposits and improved cognitive markers in transgenic Alzheimer's model mice. Human trials are ongoing. These findings are not a treatment claim.

Technology & Features

Tru-Vu Omniscreen Eyeset Glasses
The patented Omniscreen design uses 8 blue-tinted white LEDs over a silver reflector behind a translucent screen — dispersing light safely and evenly across both visual fields. It can stimulate each hemisphere at a different frequency simultaneously, enabling independent left-brain/right-brain entrainment for superior mood and cognitive results.

Proprietary Randomization
Stimulation varies within each session — enhancing your brain's ability to dissociate and track the entrainment signal, producing more effective and consistent brainwave guidance than fixed-frequency devices.

Soft-Off Fade Technology
Sessions end with a gradual dimming of lights and tones, preventing startle response and preserving the session's calming effects into the transition back to waking.

Night-Vue Illuminated Buttons
Backlit tactile controls — power, intensity, and volume — visible in the dark for bedtime use without disrupting your wind-down routine.

Session Editor Software (optional add-on)
Design, customize, and download your own AVE sessions via the DAVID Session Editor software (+$99 at checkout).

What's Included

Who Is the DAVID Delight Plus For?

• Anyone who wants more depth and variety than the base Delight's 10 sessions provide
• People with chronic sleep issues, fibromyalgia, or stress who benefit from a comprehensive, non-pharmaceutical session library
• Students and professionals seeking drug-free cognitive support — focus, memory, and mental clarity
• Wellness practitioners, biohackers, and anyone exploring 40 Hz gamma protocols
• Seniors interested in cognitive maintenance and balance improvement
• Those who want to customize their own sessions via the optional Session Editor
• Anyone ready to make a serious, long-term investment in their brain health

One of our most popular sets!

The Sacred Solfeggio Tuning Forks are a set of forks in the sacred frequencies known as the Secret Solfeggio.

Deciphered by Dr. Joseph Puleo using the ancient Pythagorean method of reducing the verse numbers to their single digit integers, the codes revealed a series 6 of electro-magnetic sound frequencies that correspond to the 6 missing tones of the ancient Solfeggio scale. These original sound frequencies were used in Ancient Gregorian Chants. The chants and their special tones were believed to impart tremendous spiritual blessings when sung in harmony during religious masses. These frequencies can now be produced with the Sacred Solfeggio Tuning Forks.

Sound healing using the Solfeggio frequencies has been proven as an effective tool in healing generational trauma and DNA. Read more about the research here.

Included forks and frequencies

UT (ut quent laxis) Liberating Guilt & Fear ... 396 Hz RE (resonare fibris)

Facilitating Change & Support ... 417 Hz MI (mira gestorum)

Transformation & Miracles DNA Repair ... 528 Hz FA (famuli tuorum)

Connecting & Relationships ... 639 Hz SOL (solve polluti)

Awakening Intuition ... 741 Hz LA (labili reatum)

Returning to Spirit ... 852 Hz

The Sacred Solfeggio Tuning Forks are available in either the original set of 6 or in the complete set of 9 forks, which includes the 3 missing notes (174 Hz, 285 Hz, & 963 Hz.)

Each kit includes a velvet pouch.

Please note the frequencies of the weighted set are different from the unweighted Solfeggio tuning fork set. The frequencies of these forks are proprietary.

Should I choose Standard or Weighted?

Which style is right for you? Standard tuning forks are great for vibrational healing such as sound toning and for working with energies, such as opening energy blocks, clearing chakras, or cleansing auras. In the process of promoting the flow of vital life force within the human body and the human energy field, they are intended to assist and facilitate clearing, balancing, and energizing the energy body in a simple and gentle way. Standard tuning forks also have the unique quality of being able to produce harmonic intervals (multiple pitches that occur at the same time) when struck together. Weighted tuning forks don't produce harmonic intervals as easily, however they have a much stronger vibration, making them easier to feel, and excellent for uses such as acupuncture, sound puncture, and muscle relaxation techniques. In addition to their own sound and vibrational healing qualities, weighted tuning forks can physically transfer their frequency of vibration to the body by using forced resonance, or by directly applying the handle (also called stem) of the tuning fork on the body at point of focus, such as a meridian or chakra. This is a way of creating movement or frequency vibration in any area of the body, and as such, weighted tuning forks are known to give immediate relief from pain when used with interferential therapy techniques. Weighted tuning forks vibrate for longer periods of time and stay at their exact frequency longer. This makes them great for accurate or precision tuning or toning when doing sessions on yourself or others.

Weighted Frequencies are different from Unweighted: 69.5 Hz RE, 66 Hz UT, 88 Hz MI, 106.5Hz FA, 123.5 Hz SOL, 142 Hz LA

About our Tuning Forks Our tuning forks are made from a special Aluminum Alloy that is heat treated giving them a very pure tone. The single fundamental frequency will remain constant for up to 15-20 years and the non-tarnishing material will not rust or corrode. Each fork is tuned by hand to an accuracy of /- 0.25% or better.

Please do not confuse our tuning forks with inferior products being made in China and Pakistan.

Rubber mallet with lightweight handle and is an ideal size and weight for use with all tuning forks. Maximum durability is achieved with minimum attack.

Actual mallet head color will vary but will be a variation of dark blue.