DoomFuzz DSP: Recreating Classic Diode Clipping Distortion with Modern DSP Technology

DoomFuzz DSP is a JUCE framework-based VST3 audio plugin project aimed at simulating classic diode clipping distortion using modern DSP architecture, providing music producers and audio engineers with an experimental tone-shaping tool. Additionally, it serves as a complete template for audio DSP development, demonstrating the application of modern software engineering practices in professional-grade audio processing tools.

The project is maintained by kjoseph218 and hosted on GitHub (original link: https://github.com/kjoseph218/doom-fuzz-dsp), with a release date of 2026-06-06.

Fuzz is one of the most extreme distortion effect types, producing strong harmonics and a unique 'fuzzy' tone by clipping the signal to near-square waves. The core circuit of classic Fuzz effectors uses germanium or silicon diodes for signal clipping—when the signal voltage exceeds the conduction threshold (about 0.3V for germanium tubes, 0.7V for silicon tubes), the diode conducts and flattens the signal peaks, generating rich odd-order harmonics.

Converting analog circuits to digital algorithms faces challenges such as nonlinear modeling, sampling rate aliasing, numerical stability, and real-time performance.

DoomFuzz DSP is built on WolfSound's Audio Plugin Template v2, with core features including:

• C++ 23 standard: Writing safe and efficient code using modern C++ features;
• CPM package manager: Easily integrating third-party libraries with support for semantic versioning;
• Strict code standards: Highest warning level with warnings treated as errors;
• GoogleTest unit testing: Verifying the correctness of DSP algorithms;
• Multi-IDE support: Compatible with Visual Studio, VS Code, Xcode, CLion, and NeoVim.

The development workflow uses CMake preset configurations to simplify cross-platform builds, implements CI/CD pipelines via GitHub Actions, and integrates clang-format for automatic code formatting.

The project uses the JUCE framework, whose advantages include cross-platform audio I/O abstraction, a built-in parameter management system (supporting automation, undo/redo, etc.), and rich GUI components.

Core DSP algorithms include:

• Diode clipping simulation: May use lookup tables, function approximation, or circuit simulation techniques;
• Anti-aliasing processing: Eliminating high-frequency aliasing via oversampling and polyphase filtering;
• Parameter smoothing: Using first-order low-pass filters to interpolate parameter changes and avoid audio pops.

DoomFuzz DSP is suitable for various scenarios:

• Music production: Heavy metal/Doom Metal (thick distortion), experimental music/noise (extreme clipping), retro tone reproduction (classic Fuzz effects);
• Sound design: Synthesizer tone enhancement, drum processing, vocal effects, film sound effect design;
• Agentic audio workflows: Potential integration of AI/automation features such as automatic tone matching, intelligent preset recommendations, and batch processing.

For audio DSP learners, the project provides:

• Complete project structure: Demonstrating the organization of professional audio plugins;
• Modern C++ practices: Applications of smart pointers, RAII, move semantics, etc.;
• Best practices for build systems: CMake configuration handling cross-platform builds.

Supporting learning resources include YouTube video tutorials for the WolfSound template, JUCE development courses, and sample code.

The project uses the Unlicense, allowing free use, modification, and distribution (including commercial projects) without the need for attribution.

Dependency licenses:

• CPM: MIT License;
• JUCE: GPL/commercial dual license;
• GoogleTest: BSD License.

Users must comply with the license terms of each dependency.

DoomFuzz DSP demonstrates key practices in modern audio development:

1. Technical inheritance: Recreating classic effects with contemporary technology while preserving the essence of music history;
2. Engineering standards: Reflecting professional software development processes from code formatting to CI/CD;
3. Open source spirit: Permissive licenses lowering the entry barrier;
4. Cross-platform thinking: Based on JUCE to ensure the plugin runs on mainstream systems and DAWs.

For music producers, it is an experimental tone tool; for developers, it is a high-quality resource for learning modern audio DSP.