project name:	duatone
project url:	https://github.com/roiyaru-bokujin/Duatone
author:	roiyaru
description:	two-voice tone generator for oscilloscope and Lissajous visualization
discussion url:	https://llllllll.co/t/duatone/74866
documentation url:	https://github.com/roiyaru-bokujin/Duatone/blob/main/README.md
tags:	synth utility engine

Duatone

Duatone screenshot

Duatone is a two-voice tone generator for norns made for shaping Lissajous figures and oscilloscope motion. By default the voices are panned left and right, making it easy to view each waveform separately while dialing in phase and frequency relationships.

Installation

Requires: norns

Install via Maiden or clone/download this repo to:

/home/we/dust/code/duatone

Restart norns after install so SuperCollider picks up Engine_Duatone.sc.

Features

Two independently shaped voices with per-side frequency, phase, waveform, and volume
Four waveforms: sine, square, triangle, saw
Per-side phase modulation with adjustable rate and span limits
Shared sweep modes: WRAP and PING-PONG
Seven presets tuned for Lissajous loops, knots, and geometric figures
A focused screen layout that keeps the active side easy to read while editing

Controls

E1: step through the preset shapes
E2: fine-tune the selected side's frequency
E3: change the selected side's waveform
tap K2: switch the selected side (L / R)
hold K2 + E2: coarse-tune the selected side's frequency
hold K2 + E3: adjust the selected side's volume
tap K3: toggle phase modulation for the selected side
hold K3 + E2: disable modulation and set a manual phase

Parameters

Levels: L volume, R volume, global volume
Modulation: phase sweep, L mod rate, R mod rate
Modulation spans: L mod span min, L mod span max, R mod span min, R mod span max
Stereo placement: L pan, R pan

By default the voices are hard-panned left and right for oscilloscope viewing and Lissajous shaping. Set both pan controls to 0 for dual-mono output.

Presets

The presets recall waveform, frequency, and phase relationships for both sides as starting points for different Lissajous knots, loops, and geometric figures. Volume, pan, modulation depth, and sweep settings remain open for performance and refinement.

Lissajous presets

Download

Duatone is available via the community catalog on norns.local, or it can be installed manually in maiden:

;install https://github.com/roiyaru-bokujin/Duatone

After installation, restart your norns to enable the new engine.