nighthawkTUBE

What you see is exactly what you hear.

Nighthawk Tube is two audio oscillators, one panned to each ear, meeting inside a glowing vacuum tube rendered entirely in particles. Their waveforms pour across the glass floor, sum into a slowly rotating interference drum, and trace a live Lissajous figure in phosphor blue-green. Turn a knob and the sound and the picture move together.

Dark for the night. Light for the day.

The instrument follows your device's appearance. Dark is the original violet-ray void, the tube glowing in near-black. Light inverts the phosphor into deep green ink on warm paper, for when an open, bright space suits the sit better than a dark one.

How the beat tones are created

A beat is the interference between two nearby tones. Play a note in one ear and a slightly different note in the other, and your auditory system fuses them and hears a third, slower pulse, the binaural beat, throbbing at exactly the difference between the two frequencies.

The perceived beat is the difference: Δ = | freqB − freqA | hertz.

You steer it with two knobs on the TUBE chassis. FREQ sets the base pitch (30 Hz–1.5 kHz, logarithmic); BEAT dials the difference tone directly, from half a hertz of shimmer up to a 120 Hz snarl on one logarithmic sweep, and holds it while FREQ moves, so the rhythm you chose survives any carrier you sweep to:

Each oscillator has its own wave morph, sine → triangle → sawtooth → pulse, its trace drawn live beneath the dial. And the BEAM switch chooses what kind of beat you're inside: SPLIT is the classic binaural pair, one tone per ear, headphones on. FUSE sums both tones into both ears: a monaural beat, a real physical pulse that works on speakers. ORBIT sweeps continuously between the two as the scope turns, and its BREATHE tempo paces that orbit at six breaths a minute, a breath pacer you don't have to watch. Why the distinction matters →

The beat, named for the brainwave it rides.

As you turn BEAT, Nighthawk Tube reads the beat frequency back to you and labels it with the EEG band that same rhythm sits in, the brainwave rate a steady pulse at that speed aligns with. Slower toward sleep, faster toward alertness; past gamma it's simply an audible tone.

Nighthawk Tube is an instrument for listening and calm focus, not a medical or therapeutic device. The band labels describe the frequency of the beat, not a promised effect.

The chakra system, tuned by pitch.

Twenty-three presets, every one with a footnote.

Nothing in the preset drawer is folklore without a citation. Each patch carries a neon sign, a provenance line, and a page of lore with live links to its sources: the studies, the primary texts, the arithmetic.

Ebonite, brass, and violet-ray.

Everything lives on one small rack under the tube: near-black panels edged in dim brass, a whisper of velvet violet under the lacquer, monospace legends. Four modules, no patch cords.

Free to sit with. Yours to keep for $2.99.

Nighthawk Tube plays free 5-minute demo sessions, a few times a day, long enough to find a tone and watch the figure light. A single $2.99 purchase unlocks Pro: the full session timer and the preset library, forever. No subscription, ever.

Nighthawk Tube · $2.99 Pro unlock · iOS