Why This Instrument Exists

Modular Systems

Eurorack operates at audio and control voltages up to ±10V. Standard metering tools calibrated for consumer or pro audio levels are useless here. OSCOPE scales its vertical range to ±10V full scale, making CV envelopes, LFO waveforms, and audio signals visible in their actual voltage context. The phase display lets you verify polarity of patch relationships directly.

Pedal Builders

Clipping behaviour — soft, hard, asymmetric — is only visible in the time domain at sufficient resolution. The waveform display shows the exact shape of distortion. The FFT analysis reveals harmonic structure: odd-order harmonics from symmetric clipping, even-order from asymmetric. The crest factor readout quantifies dynamic compression caused by gain staging decisions.

Producers

Phase correlation between left and right channels determines mono compatibility. A correlation coefficient below zero means the stereo sum will attenuate or cancel. The Lissajous XY display shows the stereo field geometrically — a vertical line is mono, a circle is 90° phase shifted, a diagonal line collapsing to a point is antiphase. These are not abstract concepts; they are directly audible on playback systems without stereo separation.

Educators

Signal behaviour — triggering, spectral content, phase relationships — is not intuitive from description alone. A real-time display running in a browser tab requires no software installation, no hardware beyond a laptop and microphone, and no prior configuration. Students can observe their own voice, an instrument, or a generated tone, and immediately see the connection between time-domain shape and frequency-domain content.

Online Oscilloscope for Modular Synth

OSCOPE provides real-time waveform display with Eurorack-calibrated voltage scaling (±10V full scale). View control voltages, audio oscillator output, LFO shapes, and envelope curves directly in your browser. No hardware required beyond your audio interface. Supports microphone input and system audio capture.

Web Audio FFT Analyzer

Real-time FFT spectrum analysis using the Web Audio API. Configurable FFT size from 512 to 8192 bins. Logarithmic and linear frequency scales. Peak frequency tracking, spectral centroid, and noise floor estimation. Split-log frequency mapping allocates 25% of screen width to 0–1kHz and 75% to 1kHz–Nyquist for simultaneous bass and treble resolution.

Guitar Pedal Signal Analyzer

Inspect clipping, harmonic distortion, and frequency response of guitar effects pedals. The time-domain display reveals waveshaping character — hard clipping shows flat tops, soft clipping shows rounded shoulders. FFT analysis identifies harmonic series: odd harmonics (3rd, 5th, 7th) indicate symmetric clipping; even harmonics indicate asymmetric or tube-like saturation. dBu and dBV readouts assist gain staging.

Phase Correlation & Lissajous Tool

Lissajous XY display plots left channel on X, right channel on Y, using a stereo ChannelSplitterNode. The resulting figure reveals phase relationships geometrically. A phase correlation coefficient is computed as the Pearson correlation between left and right buffers, displayed as a numeric value and a colour-coded bar meter. Values below zero indicate mono compatibility issues.

TECHNICAL DOCUMENTATION

ARCHITECTURE OVERVIEW

SIGNAL PROCESSING

RENDERING DESIGN

EXAMPLE CONFIGURATIONS

MODULE PRESETS