Harmonic Tension Engine

Single-file browser app with per-pair amplitude modulation (direct, unslewed), hall-ish reverb, presets, and optional MIDI input.

Global controls

Audio not started

Global beat amount (cents detune ±)

Scale

Key

Base note (leftmost center note)

Spread (semitones left to right target)

Master volume

Stereo width

Reverb dry/wet

Reverb size

Reverb decay

Slew

subtle beating Headroom OK

Preset name

Stored in browser localStorage.

Save / Load

Import / Export JSON

Presets

No preset selected

MIDI settings (receive only)

MIDI Input

MIDI not enabled

Base note from MIDI note input

Note on sets base note

Clamped to app base-note range

Amplitude CC start

CC70-CC77

MIDI mapping

Note On → base note (optional). CCs starting at selected CC control amplitude sliders 1-8. Example: CC70..77.

Last MIDI: none

Pair level sliders are capped internally at 50% DSP gain while the UI still shows 0–100%. Presets are stored per browser and site origin. iPad support for localStorage is usually fine unless private browsing or data clearing gets in the way.