Drone Generator — Reference Tones & Solfeggio

A drone is a reference pitch that keeps sounding while you play. This generator plays continuous or plucked tones at any of its instrument string references, in five concert-pitch standards plus a custom field, and includes the ten Solfeggio frequencies as listening references. No microphone is needed and nothing plays until you ask.

How to use it

1. Choose the reference pitch standard. The chip row sets A4 to 440, 432, 415, 430 or 442 Hz. The number field accepts any value from 400 to 480 Hz for anything else.
2. Pick a note. On the Instrument tab, choose a preset (guitar standard, guitar drop D, bass 4-string, bass 5-string, violin, viola, cello, ukulele) and click one of its string cards. The note becomes the active reference.
3. Start the drone. Continuous drone is the default sound mode: the tone begins with a short fade and holds until you press Stop. The Play button in the dashboard starts the active note directly.
4. Set the level. The volume slider under the controls sets the output level; start low and turn up only as far as the room needs.
5. Use the Solfeggio tab for those frequencies. Each card plays its frequency, with the name and description shown on the card.
6. Switch to Plucked string when you want a decaying tone. The same cards then behave like plucked notes rather than a held drone.

Practising intonation against a drone

1. Match the drone first. Play or sing the same note as the drone and listen for the beating between them. When the beating stops, you are in unison.
2. Move to the fifth. The fifth is the most useful interval to practise against a drone. On the violin preset, G3 and D4 are a fifth apart; on any preset, a note seven semitones above the root is the same relationship. Drone one note and play the other.
3. Then the thirds. Hold the major third, then the minor third, against the drone. These are the intervals that decide whether a chord sounds in tune, and they are the ones a singer or string player most often lets drift.
4. Play scales slowly over the drone. Keep the drone sounding and move through a scale; the notes that clash with the drone will beat clearly, and the notes that agree will lock. This is how a mode’s colour becomes audible rather than theoretical.
5. Take the drone away and check. Stop it, sing the same material, then bring the drone back. If the pitch moved, the reference was doing the work; repeat until you retain it without the tone.
6. Finish on a long tone. Hold the root against the drone for a slow count of ten and listen for the beating to settle.

Why fifth-based drones work

A perfect fifth is the interval the root’s third harmonic outlines: the third harmonic sits an octave and a fifth above the root, so a note seven semitones up is already present in the root’s overtone series at a strong level. That is why a fifth reinforces a root instead of fighting it, and why drone traditions from the tanpura of Indian classical music to the sustained strings of a medieval organum stack root, fifth and octave rather than choosing an unrelated pitch.

In practice you do not need a layered stack to use the idea. Sound the root, practise a phrase, then sound the fifth and play the same phrase; each reference exposes a different set of intervals, and the fifth is the one that shows up in most music you will play. A fifth plus any number of octaves is the same relationship, so a note that is a twelfth above the root works the same way in a higher register.

The Solfeggio frequencies

The Solfeggio tab plays ten frequencies: 174, 285, 396, 417, 432, 528, 639, 741, 852 and 963 Hz. Each card carries a short description in the tool.

• The name comes from the solfège syllables (do, re, mi…), whose written history traces to a medieval hymn, Ut queant laxis.
• The ten-frequency list itself is a modern tradition associated with sound-based relaxation and meditation practice, not an ancient scale.
• On this site they are presented as fixed listening references: a convenient set of pitches to drone on, hum with, or use as a focus during breathing practice.
• Nothing on this page claims that any frequency treats, cures, heals or diagnoses anything. This page is not medical advice.

Accuracy and limits

• One tone at a time. The generator plays a single reference tone; it does not layer root, fifth and octave together. Standing on one pitch, then the other, is the intended way to work with intervals here.
• Equal temperament. Notes are calculated in 12-tone equal temperament from the selected A4, the same system used by the site’s tuners, so a fifth is the tempered fifth rather than a pure 3:2 ratio.
• Fixed instrument presets. The Instrument tab offers eight preset string sets; there is no free chromatic note grid. The custom reference field covers 400–480 Hz for A4, not arbitrary notes.
• Finite Solfeggio set. The ten frequencies above are the whole list; the tool does not let you add more.
• Fade in and out. Tones start with a short fade, hold, and fade out when stopped, so start and stop are click-free rather than abrupt.
• Page settings do not travel in the URL. Unlike the metronome, this generator has no query parameters; the state is whatever you set in the page.
• Health disclaimer. These are reference tones. Keep the volume at a comfortable level, stop if anything hurts, and seek qualified advice for any hearing or health concern.