A real Web Audio oscillator plays each generated note at its true frequency (A4 = 440 Hz equal temperament). This version maps color continuously rather than from a fixed lookup table: hue comes from the note's pitch class (its position on the twelve-tone chroma circle, hue = pitch-class/12 × 360°), while its octave register drives lightness — a separate, well-documented cross-modal correspondence where higher pitches are consistently judged "brighter" regardless of chroma.
- Notes are launched from the chroma wheel at their hue position, then rise in major mode (buoyant, positive valence) or sink in minor mode (heavy, negative valence) through the waterfall below, accelerating with tempo-driven arousal.
- Timbre both reshapes the oscillator waveform (sine → triangle → sawtooth, mellow to buzzy) and the drawn note's shape, from a smooth circle to an angular faceted polygon.
- The valence–arousal circumplex on the right plots the same two axes psychologists use to describe emotion from music: mode sets valence, tempo sets arousal.
- Toggling Synesthesia view off desaturates every note to gray, showing the same audio structure without the automatic color mapping.