Description

⚠️ The download link below is currently broken (server-side issue). Please grab the latest release from GitHub: https://github.com/im9/oedipa/releases

Demo: https://www.youtube.com/watch?v=dgzQ71y7ijE

Oedipa is a MIDI effect that walks a Tonnetz — the 2D triangular lattice of triads connected by neo-Riemannian transforms (P / L / R) — and emits the chords it finds. Instead of writing a chord progression, you write a short cyclic program of P / L / R / hold / rest operations and let the walker turn it into harmony.

What you control:

- Start chord — click a triangle on the lattice or play notes into the device.

- Cell program — a short cyclic array of 1–8 cells. Each cell carries an op plus per-cell velocity, gate, probability, and timing. The default [P, L, R, hold] walks C → Cm → A♭ → Fm → F → Am → C over 8 cells — chromatic mediants and mode mixture, the territory NR transforms make easy.

- Jitter + seed — per-step probability of replacing the cell's op with a uniform-random one. Reproducible from the seed. 0 = strict program; 1 = random walk on the lattice.

- Rate — cell length in 16th-note steps (1–64; default 4 = 1 quarter note). Small values = arpeggio territory; larger values = long-form pad / drift.

- Voicing — close / spread / drop2, with optional 7th extension.

- Rhythm + motion — rhythm preset (legato / onbeat / offbeat / syncopated / all / turing), arp mode, step direction (forward / reverse / pingpong / random), and a Turing-machine random source for live-steered variation.

Deterministic. For a fixed configuration the walk is reproducible — scrubbing the transport or restarting playback produces the same MIDI bit-for-bit. Every cell field is independently host-automatable; the program is meant to be steered live rather than re-edited.

Steering philosophy inspired by Ornament & Crime's Automatonnetz — a small repeating program steered live, rather than a long-form sequence. Mechanics differ (4 cells of P/L/R/hold/rest with per-cell expression, vs. a 5×5 chord grid); the design intent is shared.

Requires: Live 12, Max 8.6+ (Max for Live).

Free under MIT. Source and latest release: https://github.com/im9/oedipa/releases/tag/m4l-v0.1.1