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Welcome

INNER SOUND is not about listening to sound or music. It’s about listening to yourself.

  • ​ A Path Inward: Shift your focus from external sound to your body's unique internal resonance.

  • Ease Tension: Let precision-tuned frequencies gently invite deep-seated tension in the body and mind to soften and release.

  • Create Space to Settle: Create a quiet, neutral space where your attention can rest and your body can settle into stillness.

Precision-Crafted Sound Therapy Since 1998

  • INNER SOUND tuning forks are designed to be used in pairs at the head to facilitate deep, rapid relaxation for both humans and animals.

  • ​Made in the USA: Precision-crafted from high-grade aluminum alloy, in full and selected smaller sets.

  • Deep Resonance: Creates a full, even wave of expansion and contraction that most people find deeply calming.

INNER SOUND tuning fork logo showing infinity symbol on its side with 2 forks mounted on it
MASTER THE ART OF SOUND THERAPY

  • Our Basic & Advanced Training provides the essential knowledge and practical skills needed to get the most out of INNER SOUND tuning forks in your relaxation practice. 

  • It is also the first step towards certification. Enroll in the Complete Tuning Fork Training to
    begin — the Basic and Advanced trainings taken together. Certification after that is optional, and
    the requirements are set out in our FAQs.

  • Professional & Personal Growth: Learn to seamlessly integrate tuning forks into relaxation practices or your daily personal wellness routine.

  • Original Foundations: All frequencies and fork numbers were developed by Jack Wilken and have remained unchanged since our original 2002 set. ​

  • Expert-Led Curriculum: Course content is developed by Arden Wilken, co-founder of INNER SOUND and co-creator of the INNER SOUND tuning fork method, bringing decades of hands-on experience directly to you.

Short demo of INNER SOUND Tuning Fork Session with Set of 13 showing practitioner holding 2 tuning forks, activating them and bringing the pair up to the ears and then away.

Client Feedback

"I'm always tense, and have trouble relaxing even when I'm in a sound therapy session. As soon as the forks came to my ears, I just zonked out."
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What Student & Practitioners say about our Tuning Forks

"I'm a massage therapist. I find my clients relax more quickly and allow me to go deeper if I use the tuning forks before a massage. I don't have to work so hard." Massage therapist, INNER SOUND Practitioner & Instructor, Nevada.

Register for our Tuning Fork Trainings

  • Complete Tuning Fork Training

    2026 BASIC: Oct 17 & 18 / ADV: Oct 24 & 25. 9am-1pm each day PDT via Zoom / Instructor Arden Wilken

    Starts Oct 17

    335 US dollars

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  • Repeat Complete Tuning Fork Training

    2026 BASIC: Oct 17 & 18 / ADV: Oct 24 & 25. 9am-1pm each day PDT via Zoom / Instructor Arden Wilken

    Starts Oct 17

    265 US dollars

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  • Repeat Basic Tuning Fork Training

    2026 BASIC: Oct 17 & 18. 9am-1pm each day PDT via Zoom / Instructor Arden Wilken

    Starts Oct 17

    175 US dollars

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  • Repeat Advanced Tuning Fork Training

    2026 ADV: Oct 24 & 25. 9am-1pm each day PDT via Zoom / Instructor Arden Wilken

    Starts Oct 24

    175 US dollars

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Purchase Tuning Forks

Prices are + shipping 

We ship anywhere in the US, including Alaska & Hawaii, and overseas.

For international orders, please contact us at arden@innersoundonline.com or

WhatsApp 1 (206) 618-3985 for a shipping quote.

(Sets come with a pouch, wooden hammer and rubber activator as shown)

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Inner Sound products are never discounted; our published retail price is the price. We invest in accessibility through training discounts and practitioner pricing instead.

    Frequently asked questions

    Care & Maintenance of Tuning Forks

    •  Store in a dry location without touching (in pouch) / avoid dropping

    •  Activate on rubber, or with wooden hammer for group work, not on body

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    •  Use at room temperature (68 degrees F/20 degrees C ) /

    tuning forks should feel slightly cool to the touch when you use them

    •  Use 600 grit wet/dry sandpaper for any discoloration (oxidation) spots. They do not affect the effect of the tuning forks, being cosmetic discoloration only

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    Tuning Forks will last a lifetime if well-maintained

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    man with a hammer in right hand hitting his right temple
    the 2 balls at end of a weighted showing corrosion/oxidation
    don't hit tuning forks on your body

    How to apply
    INNER SOUND Tuning forks 

    Image by Fineas Anton

    Studies

    From Practitioner Submissions
     

    Since 2002, our practitioners have recorded how clients rate their pain and stress before and after a session. Most clients report lower numbers afterward. These are self-reported ratings collected in practice rather than results from a controlled study, and we are currently having the full record analysed properly. We will publish what it shows.

    Image by Dan Dimmock

    Purity = rapid, deep relaxation

    Oscilloscope pure 5th.jpg
    INNER SOUND tuning forks are tuned twice for unparalleled precision. When utilized in pairs, this accuracy facilitates deep relaxation. Each pair is a true fifth — the higher fork vibrating exactly three times for every two of the lower. Tuned pure rather than approximately, the two tones lock together instead of wavering against each other. Most people find that steadiness makes it easier to settle and relax.
    Our tuning forks offer a level of precision that other forks don't match. Take a look at the visual difference between the two oscilloscope waveforms: the top showcases pure 5ths, while the bottom reveals less clarity. 

    Tuning Fork Frequencies

    INNER SOUND tuning forks are designed as related sets and pairs. Each fork has its own stamped frequency, but our work emphasizes the relationship between the two forks in a pair.

    Every pair is tuned twice: first to the individual frequency of each fork, then again in relation to its partner, so the two tones sound naturally clear and harmonious together.

    The frequencies below are provided for customers, students, and practitioners who would like the technical specifications. INNER SOUND forks are heard and listened to rather than pressed against the body.

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    Set of 13 Pair Frequencies

     

    1st pair 31 Hz and 47 Hz

    2nd pair 47 Hz and 71 Hz

    3rd pair 71 Hz and 106 Hz

    4th pair 106 Hz and 159 Hz

    5th pair 159 Hz and 239 Hz

    6th pair 239 Hz and 358 Hz

    7th pair 358 Hz and 538 Hz

    8th pair 538 Hz and 806 Hz

    9th pair 806 Hz and 1209 Hz

    10th pair 1209 Hz and 1814 Hz

    11th pair 1814 Hz and 2721 Hz

    12th pair 2721 Hz and 4082 Hz​

    ​OM Set of 14 Pair Frequencies

     

    1st pair 26.89 Hz and 40.33 Hz

    2nd pair 40.33 Hz and 60.49 Hz

    3rd pair 60.49 Hz and 90.73 Hz

    4th pair 90.73 Hz and 136.1 Hz

    5th pair 136.1 Hz and 204.15 Hz

    6th pair 204.15 Hz and 306.23 Hz

    7th pair 306.23 Hz and 459.35 Hz

    8th pair 459.35 Hz and 689.03 Hz

    9th pair 689.03Hz and 1033.55 Hz

    10th pair 1033.55 Hz and 1550.33 Hz

    11th pair 1550.33 Hz and 2325.15 Hz

    12th pair 2325.5Hz and 3488.25 Hz​

    13th pair 3488.25 Hz and 5232.38 Hz

    RELAX WITH TUNING FORKS

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