Real-time Visualizer

Master Volume 70%

Concert Pitch Tuning 440 Hz (Standard)

ADSR Envelope Shaping

Attack

0.02s

Decay

0.10s

Sustain

0.80

Release

0.05s

Pure Tone & Sound Generator

Note: A4 (0 cents)

Waveform Shape

Frequency (Hz) 440.00 Hz

Duration (Playback & Export)

Quick Presets

440 Hz (A4) Standard Pitch Sine

432 Hz Verdi / Solfeggio Pitch

528 Hz Transformation Pitch

1000 Hz Acoustic Reference Tone

Pink Noise Acoustic Masking

Stereo Binaural Beats Generator Headphones Required

Binaural beats send slightly different frequencies to each ear, causing the brain's auditory brainstem to perceive a third pulsating beat equal to the frequency difference.

Base Carrier Frequency (Left Ear) 210.0 Hz

Target Brainwave Beat Frequency 10.0 Hz (Alpha)

Delta (2.0 Hz) Deep Sleep & Healing 0.5 - 4 Hz

Theta (6.0 Hz) Meditation & REM 4 - 8 Hz

Alpha (10.0 Hz) Relaxed Focus & Flow 8 - 13 Hz

Beta (20.0 Hz) Active Focus & Cognition 13 - 30 Hz

Gamma (40.0 Hz) Peak Insight & ASSR 30 - 100 Hz

Isochronic Pulses & Amplitude Modulation

Isochronic tones use sharp amplitude modulation turning a carrier tone on and off at regular intervals. Can be played over speakers (does not require headphones).

Carrier Pitch Frequency 440 Hz

Pulse Rate (Hz) 10.0 Hz

Modulation Depth (%) 100%

Frequency Sweep Generator (Chirp Signal)

Start Frequency (Hz) 20 Hz

End Frequency (Hz) 20000 Hz

Sweep Duration (Seconds)

Sweep Curve Scale

Psychophysiology & EEG Stimulus Engine Laboratory Grade

Auditory Steady-State Response (ASSR): 100% amplitude modulated sine wave at 40 Hz used to evoke auditory gamma-band neural synchrony in EEG/MEG paradigms.

Carrier Frequency

Solfeggio & Sacred Frequencies

174 Hz Foundation & Anesthetic relief

285 Hz Quantum Cognition & Tissue Renewal

396 Hz Liberation from Guilt & Fear

417 Hz Undoing Situations & Facilitating Change

528 Hz Miracle Tone & DNA Transformation

639 Hz Harmonizing Relationships & Community

741 Hz Awakening Intuition & Expression

852 Hz Returning to Spiritual Order

963 Hz Crown Chakra & Divine Light

Online Tone Generator & Psychophysiology Stimuli Synthesizer

Rumbling is a browser-based, high-fidelity online tone generator and audio signal laboratory designed for auditory researchers, psychophysiologists, neuroscientists, audio engineers, sound designers, and music enthusiasts. Utilizing the Web Audio API, this tool generates continuous pure sine tones, square waves, triangle signals, sawtooth waves, calibrated noise profiles, binaural beats, and specialized EEG stimulus paradigms without requiring software installation or plugins.

Psychophysiology & Electrophysiology Stimuli

In cognitive neuroscience and psychophysiology experiment protocols, precise auditory stimulation is vital. Rumbling generates:

Auditory Steady-State Response (ASSR): 40 Hz amplitude-modulated tones to evaluate auditory gamma entrainment and cortical response.
Auditory Oddball ERP Paradigms: Random sequence generators producing standard (80%) vs. deviant (20%) pitch triggers for Event-Related Potential (ERP) components such as Mismatch Negativity (MMN) and P300 waves.
Pure Tone Audiometry: Calibrated octave step frequencies (125 Hz to 16 kHz) for psychoacoustic hearing threshold evaluation.

Binaural Beats & Brainwave Entrainment

Binaural beat synthesis generates slightly different pitch frequencies independently in the left and right stereo channels. When listened to through headphones, the brain perceives a central auditory pulse corresponding to the frequency difference:

Delta Waves (0.5 – 4 Hz): Deep restful sleep, restoration, and unconscious states.
Theta Waves (4 – 8 Hz): Meditation, deep relaxation, and REM imagery.
Alpha Waves (8 – 13 Hz): Calm alertness, stress reduction, and mental flow state.
Beta Waves (13 – 30 Hz): Active problem-solving, cognitive focus, and alertness.
Gamma Waves (30 – 100 Hz): Peak concentration, associative memory processing, and neural synchrony.

Music Tuning & Solfeggio Synthesizer

For musicians and acoustic engineers, Rumbling supports custom reference pitch calibration (e.g., 440 Hz ISO standard, 432 Hz Verdi tuning, 435 Hz Diapason Normal, and 415 Hz Baroque tuning). It also features an instant Solfeggio frequency generator providing 174 Hz, 285 Hz, 396 Hz, 417 Hz, 528 Hz ("Transformation Tone"), 639 Hz, 741 Hz, 852 Hz, and 963 Hz pure harmonic sine tones.

High Precision Offline WAV Exporter

Export uncompressed 16-bit PCM stereo WAV files directly from your browser. Utilizing an `OfflineAudioContext`, Rumbling renders ultra-precise frequency sweeps (logarithmic and linear chirps), calibrated white/pink/brown noise, custom binaural beats, and ADSR envelope shaped tones suitable for research stimuli, sound design, equipment testing, and acoustic calibration.