Beyond a Single Reference Pitch: The Chord Drone Builder
If you've done any serious intonation work, you already know the single drone. You pick a note — usually the tonic — set it droning, and play scales and long tones against it, listening for the beats to slow and stop as your pitch locks in. It's one of the best practice tools in existence, and the free single drone in Virtuosic does it beautifully.
But a single drone teaches you to be in tune with one note. That's not quite the skill you need. In an ensemble, you're never tuning to a single pitch; you're finding your place inside a chord. The note that's perfectly in tune as the root of a chord is a few cents off as its third, and different again as its fifth. A player who has only ever practiced against a single drone has trained one dimension of a three-dimensional problem.
The chord drone builder is the tool for the other two dimensions. It sustains a whole harmony under you, so you can practice being in tune with the thing you're actually in tune with when it counts: everyone else.
Build Any Chord You Need
Start from a root note and an octave, then pick your harmony. There are twelve presets built in: Major, Minor, Diminished, Augmented, Sus2, Sus4, Power (5th), Dominant 7, Major 7, Minor 7, Diminished 7, and a Custom voicing you build yourself on the note ring. Between them you can sound essentially any chord you'll meet in the repertoire and hold it under your instrument indefinitely.
An interactive note ring shows you the chord you've built — the voices lit up around the circle — so you can see the harmony as well as hear it, and tweak individual notes into a custom voicing when you want something the presets don't cover.
Inversions, Because Voicing Changes Everything
A C-major chord with the C on the bottom is a different sonic object than the same chord with the E on the bottom. The bass note anchors your ear, and where a note sits in the voicing changes exactly how you tune to it. So the builder lets you choose the inversion: root position, first, second, or third. Practice finding your third above a root-position chord, then flip to first inversion and find that same note as it sits above the third in the bass — you'll hear that "in tune" moved, and learning to move with it is the entire skill.
ET or True Just Intonation
This is the feature that makes the chord builder a genuine intonation instrument rather than a novelty.
By default the chord sounds in equal temperament (ET) — the tuning of a piano, where every interval is a mathematically even compromise. Flip the toggle to just intonation (JI) and the builder retunes the chord to pure ratios: the major third drops to its true 5:4, the fifth sits at a perfect 3:2, and the beats between the notes vanish. This is how a well-tuned ensemble actually sounds — locked, ringing, beatless — and it's audibly different from the piano's version.
Practicing against a JI chord trains your ear to the target that matters. If you've ever been told your third is "sharp" when your tuner said you were dead-on, it's because your tuner measures against ET and your section is playing JI. Set the builder to JI, play your third against it, and tune until the beating stops. That's the note. The just-intonation explainer goes deep on why this gap exists; the chord builder is where you practice living inside it.
Arpeggiate It
Sometimes you don't want the chord all at once — you want to hear it unfold. The Arpeggiate control walks the notes of the chord in sequence instead of sounding them together. It's useful for hearing each chord tone in isolation before you commit to tuning against the full stack, and for ear-training the shape of a voicing from the bottom up.
Eleven Voices to Tune Against
Tuning against a raw sine wave is clean but clinical, and it doesn't sound like anything you actually play with. So the drone — single and chord alike — offers a range of timbres: Sine, Warm, Bright, Clarinet, Oboe, Trumpet, Strings, Violin, Organ, and more. These aren't gimmicks; they're built with real formant filtering, gentle ensemble detuning, breath and bow noise, and vibrato, so a "Strings" drone genuinely sits in the ear like a section. Tuning your oboe against an oboe-timbre drone, or your section part against Strings, is meaningfully closer to the real task than tuning against a beep.
Where the Line Is
The single drone is free — one sustained reference pitch, all the timbres, octave selection, and fine-tune offset. That alone is a complete long-tone tool and always will be.
The chord builder is Premium — the twelve chord types, inversions, the ET/JI toggle, arpeggiation, and the note ring. It's part of the same $119.99-a-year Premium tier that unlocks the AI coaching, the etude generator, and the rest of the analytics surface.
A Note From the Developer
Long-tone-against-a-drone is the oldest intonation exercise there is, and it's still one of the best. But the more I taught, the more I noticed that students who practiced only against a single tonic drone would still drift the moment they were inside a real chord — because "in tune" isn't a property of a note, it's a property of a note's place in a harmony. The chord builder lets you practice the real thing: find your pitch inside a full, justly-tuned chord, in any inversion, against a voice that sounds like something you'd actually play with. Do that for a few weeks and the section rehearsal stops being a place you get corrected and starts being a place you already fit.
Open the Drone, switch to Chord mode, build a major chord, and flip it to JI. Play your third against it and tune until the beats disappear. That's the sound you've been chasing.
— Forrest