SuperDuper DSP

Open-source CLAP plugin suite — 23 focused effects and synths written in Rust, with a retro phosphor-green theme, custom egui GUIs, factory presets, and CLAP state persistence. CLAP is the primary format; VST3 and Audio Unit v2 ship via clap-wrapper bridges, so the same .clap core loads everywhere.

Built as a daily-driver toolkit, not a product launch — I use it myself in REAPER and Ableton. Dogfooding is the design constraint: every plugin has to earn its slot on a real mix bus before it stays in the repo. Works in any CLAP/VST3/AU host: REAPER, Bitwig, Studio One, FL Studio, Logic 11+, Ableton, Cubase, DaVinci Resolve, GarageBand.

What’s in the suite

17 effects: EQ (3-band RBJ biquad) · LinEq (linear-phase 2048-tap FIR mastering EQ) · Compressor (soft-knee feed-forward + sidechain) · Saturator (tape/tube/soft-tanh, 2×/4× oversampling) · Delay (Lagrange interpolation, tape feedback, ducking) · Reverb (Dattorro plate) · Supermass (cascade reverb→chorus→reverb, 28s tail) · Limiter (lookahead brickwall, true-peak) · Spectrum (BS.1770 LUFS-M/S/I meter) · Vocal (de-esser, plosive killer, hum/click removal) · Chorus · Looper (Mobius-style 4-track) · Filter (resonant multi-mode + LFO) · MidSide (M/S width) · Soothe (24-band dynamic resonance suppressor) · NAM (Neural Amp Modeler, loads community .nam files) · Denoise (planned RNNoise port).

6 instruments: Pad (8-voice poly synth) · Ambient (autonomous chord-drone generator) · Wave (wavetable bass/lead, mouse-editable curves, Serum export) · Kubyz (jaw-harp physical model with IPA vowel pad) · Drum (6-voice analog drum machine) · Sampler (poly WAV player, YIN pitch detection).

Common across plugins: sidechain ports, host automation write, A/B + Initialize workflow, tempo-synced LFOs, a live spectrum strip, and a [bNNNNN] build-number suffix in display names so you always know which bundle a session loaded.

Architecture

Cargo workspace: sdk/ (CLAP helpers) → synth-core/ (shared DSP blocks: Biquad, DelayLine, Oversampler) → effects/ (the plugins). DSP is research-grounded — Dattorro reverb topology (1997), Giannoulis compressor design (JAES 2012), the RBJ EQ cookbook. A standalone tools/sdsp-runner lets you process a WAV through a plugin without a DAW, and end-to-end tests audit output WAVs for THD/aliasing.

make all     # CLAP + VST3 + AU
make clap    # just .clap bundles
make wave    # a single plugin

Install: grab bundles from Releases, drop the .clap into your CLAP folder, rescan. MIT licensed.

Agent tooling

Three Claude Code skills wrap this repo for AI-assisted DSP work: superduper-plugin (scaffold a new CLAP plugin with the full boilerplate checklist), sdsp-chain (run a headless mastering chain with per-stage LUFS/dBTP/RMS), and sdsp-runner (single-plugin testing). The CLAUDE.md in the repo (~49KB) is the harness that makes adding a plugin a repeatable agent task rather than a from-scratch build.

Connections

• project-superduperai — same SuperDuper brand; this is the audio-DSP arm of the portfolio, the products half of the consulting+products barbell.
• project-kubizbeat — the Kubyz instrument here is the same Bashkir jaw-harp physical model that powers KubizBeat. Cultural-preservation DSP reused as a synth voice; shared physical-modeling code.
• cli-first-testing — sdsp-runner and the WAV-audit tests are the CLI mirror of every plugin: if a DSP block works headless from the command line, it’s decoupled from the GUI and the host.
• privacy-as-architecture — native plugins, no accounts, no telemetry, no network. The audio never leaves your machine; same on-device-by-default stance as the rest of the portfolio.