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Scopion

Scopion (v1.0.0) is part of The Most Useless Plugins collection — 100% free forever, with zero accounts, zero subscriptions, zero trial timers, and zero dongles: a studio-grade Stereo Time-Domain Oscilloscope (SIGNAL) and Calibrated Hann FFT Spectrum Analyzer (SPECTRUM) engineered in Rust (nih-plug + nih_plug_egui) with zero latency sample-accurate pass-through processing.

Scopion v1.0.0 — Nordic Daylight Studio Interface & Time-Domain Blueprint Scope

Your DAW already has three analyzers — so naturally we built a sub-sample precision oscilloscope with a scorpion logo:
Mixing purely by ear sounds heroic right up until a sub-bass note drifts 90 degrees out of phase with your kick, or an uninvited 28 Hz DC bump quietly eats 4 dB of mastering headroom while everyone blames the limiter. Yet half of existing scope plugins look like 1998 radar screens with jagged 1-sample trigger jitter, uncalibrated FFT windows that misread 0 dBFS sine waves by 6 dB, and zero way to save a clean vector graph without taking an ugly OS screenshot.

Scopion fixes every tiny annoyance no one asked us to fix: a 30 Hz 2nd-order Butterworth zero-crossing trigger with linear sub-sample interpolation (< 0.5% spread at 1 ms zoom), a single-pass f64 stereo Cooley-Tukey FFT calibrated to read 0.00 dB on a 0 dBFS sine wave, a live REF dashed A/B memory overlay, 4 scope palettes (Daylight, Obsidian, Phosphor, Blueprint), a resizable 75%–200% + corner-grip UI, and up to 8K (7680 × 4320) PNG & Vector SVG export. Completely unnecessary and absurdly accurate.

Cross-Platform Release & Installation

Scopion is compiled, signed, and packaged natively for all major desktop DAWs — completely free:

  • Linux (x86_64): Native CLAP (~/.clap/), VST3 (~/.vst3/), and Standalone Desktop Application (scopion) featuring automatic PipeWire @DEFAULT_AUDIO_SINK@ monitor routing and guaranteed silent playback (zero echo/feedback risk).
  • Windows (x86_64): Native CLAP (C:\Program Files\Common Files\CLAP\) and VST3 (C:\Program Files\Common Files\VST3\) bundles.
  • macOS (Universal2 — Apple Silicon & Intel): Native Apple Logic Pro / GarageBand / MainStage Audio Unit v2 (Scopion.component) (complete with an automatic floating On-Screen QWERTY & Numeric Keypad when naming exports in Logic Pro) and CLAP (Scopion.clap) bundles. (On macOS, clear Gatekeeper quarantine once in Terminal: xattr -dr com.apple.quarantine ~/Library/Audio/Plug-Ins/Components/Scopion.component ~/Library/Audio/Plug-Ins/CLAP/Scopion.clap.)

Precision Metering Architecture

1. Sub-Sample Oscilloscope (SIGNAL) & Adaptive Waveform Rendering

Scopion Time-Domain Oscilloscope in Blueprint Theme
  • 30 Hz Butterworth Trigger (30 Hz ZEROS vs. FREE RUN): Uses an RBJ 2nd-order Butterworth lowpass trigger (fc = 30 Hz, Q = 1/√2) to isolate the true fundamental cycle of basslines and complex synths despite heavy upper harmonics, distortion, or DC offset — then computes exact linear sub-sample crossings (frac = cur_trig / (cur_trig - prev_trig)) to eliminate 1-sample horizontal trigger jitter.
  • Three-Stage Adaptive Waveform Engine: Automatically shifts between smooth Catmull-Rom cubic spline interpolation at deep zoom (< 1 sample/pixel), 100% raw exact samples at medium zoom (1..12 samples/pixel), and chronological [min, max] sub-pixel envelope columns across the full 1.5 s time window (> 12 samples/pixel) so peaks never alias into artificial flat shelves.

2. Laboratory-Calibrated f64 Stereo FFT (SPECTRUM) & Musical Readout

Scopion Calibrated FFT Spectrum Analyzer with Frozen Dual-Channel & Reference Readout
  • 0.00 dB Full-Scale Sine Calibration: Packs Left (Re) and Right (Im) into a single pre-allocated f64 Radix-2 Cooley-Tukey FFT (256 to 32,768 points, zero heap allocations on audio or UI threads) using a mean-normalized Hann window (2 / N AC scaling, 1 / N DC scaling) paired with fast-attack (0.65) / smooth-release (0.22) asymmetric ballistic smoothing.
  • Deep-Zoom Harmonic Inspection & REF A/B Overlay: Toggle LOG (15.625 Hz – 32 kHz adaptive sub-octave grid) or LIN (0 Hz – Nyquist), lock a 262,144-sample (~5.4 s at 48 kHz) FREEZE buffer, and capture both the stereo waveform and spectrum into an instant dashed REF overlay (CH L, CH R, REF L, REF R) with live cursor hover readouts including musical pitch & cents.
Scopion Sub-Octave Logarithmic Deep Zoom Harmonic Inspection

3. Four Scope Color Schemes, Resizable Window & Up to 8K PNG / SVG Export

  • Instant Palette Switching: Keep the warm Nordic Daylight Minimal outer console intact while switching the recessed measurement stage between Daylight, Obsidian, Phosphor, and Blueprint — reflected live on screen and in every export.
  • Publication-Grade PNG & Vector SVG Export: Click Export (or right-click inside the plot) to render anti-aliased Xiaolin Wu RGBA PNG bitmaps or resolution-independent vector SVG documents from 320 × 180 up to 7680 × 4320 (8K), complete with CH L, CH R, dashed REF, and grid annotations.
  • Proportional Resizable UI (75%–200% & Corner Grip): Scale the plugin smoothly from 720 × 450 up to 3840 × 2160 using the header percentage preset dropdown, the right-click context menu, or the bottom-right corner drag grip (Shift+Drag locks the 1040 : 640 aspect ratio; double-click resets to 100%).

📖 Scopion User Manual & Reference Guide

Want the full 4-theme gallery, mouse & zoombar shortcuts, Linux standalone PipeWire routing tips, studio metering recipes, or the complete parameter & state reference?

👉 Open Interactive Scopion User Manual & Reference Guide →

Part of The Most Useless Plugins collection.