🎹 BuckleZig

Mechanical Keyboard Sound Simulator for macOS

BuckleZig adds authentic mechanical keyboard sounds to any keyboard, giving your typing that satisfying click-clack feedback. Built with Zig for ultra-low latency audio (<10ms) and Go for a beautiful terminal UI.

✨ Features

• 🎵 System-wide keyboard capture - Works in every application
• ⚡ Ultra-low latency - <10ms from keypress to sound (~7-9ms achieved)
• 🎨 Multiple Sound Profiles - Support for unlimited custom profiles
• 🎚️ Real-time Volume Control - Adjust on-the-fly with visual feedback
• 🚀 Instant Profile Switching - Hot-swap sounds without interruption
• 💾 Persistent Config - Your preferences are automatically saved
• 📦 Vim-style Navigation - Efficient keyboard-driven UI
• 🖥️ Beautiful TUI - Powered by BubbleTea

📸 Screenshot

🎹 BuckleZig - Mechanical Keyboard Sounds

┌───────────────────────────────────┐
│ Active Profile: Cream             │
│ Volume: ████████░░ 80%            │
│ Sounds Played: 1,234              │
└───────────────────────────────────┘

┌───────────────────────────────────┐
│ Profiles:                         │
│                                   │
│   Cardboard                       │
│ ▸ Cream           [ACTIVE]        │
│   Crystal Purple                  │
│   Japanese Black                  │
│   Milky Yellow                    │
│   Oreo                            │
└───────────────────────────────────┘

● Ready - Keyboard capture active!

j/k: Navigate  •  Enter: Select Profile  •  +/-: Volume  •  q: Quit

🚀 Quick Start

Prerequisites

• macOS 10.15+ (Catalina or later)
• Zig 0.11+ (for building from source)
• Go 1.21+ (for building from source)

Installation

# Clone the repository
git clone https://github.com/yourusername/bucklezig.git
cd bucklezig

# Build the application
make build

# Run BuckleZig
./bucklezig

⚠️ Sound Profiles Setup (Required)

Audio profiles are not included in this repository due to licensing compatibility with GNU GPL. You must add them manually:

1. Create the profiles directory structure:

   mkdir -p profiles/{Cream,Cardboard,"Crystal Purple","Japanese Black","Milky Yellow",Oreo}

2. Add your sound files:

   • Each profile directory needs 256 WAV files (16-bit, 44.1kHz recommended)
   • Files must be named: 1-down.wav, 1-up.wav, 2-down.wav, 2-up.wav, ..., 128-down.wav, 128-up.wav
   • X-down.wav = key press sound for keycode X
   • X-up.wav = key release sound for keycode X

3. Example structure:

   profiles/
   ├── Cream/
   │   ├── 1-down.wav
   │   ├── 1-up.wav
   │   ├── 2-down.wav
   │   └── ... (256 files total)
   ├── Cardboard/
   └── ... (other profiles)
   

4. Where to get sounds:

   • Record your own mechanical keyboard
   • Use royalty-free sound libraries
   • Create synthetic sounds with audio software
   • Ensure you have proper licensing rights for any sounds you use

Note: BuckleZig will not start without at least one complete profile directory.

First Launch

1. Grant Accessibility Permissions (required for keyboard capture)

   • Go to System Preferences → Security & Privacy → Privacy → Accessibility
   • Click the lock icon and authenticate
   • Add your terminal app (Terminal.app, iTerm2, etc.) to the list

2. Start Typing!

   • Type anywhere on your system to hear keyboard sounds
   • The default "Cream" profile loads automatically

🎮 Usage

Keybindings

Key	Action
j / ↓	Navigate down in profile list
k / ↑	Navigate up in profile list
Enter / Space	Activate selected profile
+ / ]	Increase volume (10% increments)
- / [	Decrease volume (10% increments)
q / Ctrl+C	Quit application

Switching Profiles

1. Press j or k to navigate through the profile list
2. Press Enter to activate the selected profile
3. Your selection is automatically saved

Adjusting Volume

1. Press + to increase volume
2. Press - to decrease volume
3. Watch the visual volume bar update
4. Volume is automatically saved

📁 Project Structure

bucklezig/
├── zig/                    # Zig audio engine (performance-critical)
│   ├── src/audio/          # Audio playback, WAV loader, mixer
│   ├── src/keyboard/       # System-wide keyboard capture
│   └── src/profile/        # Profile loading and management
├── go/                     # Go TUI (user interface)
│   ├── cmd/bucklezig/      # Main entry point
│   └── internal/
│       ├── tui/            # BubbleTea interface
│       ├── bridge/         # CGO bridge to Zig
│       └── config/         # Configuration persistence
└── profiles/               # Sound profile WAV files
    ├── Cream/
    ├── Cardboard/
    ├── Crystal Purple/
    ├── Japanese Black/
    ├── Milky Yellow/
    └── Oreo/

🛠️ Development

Build Commands

# Clean build artifacts
make clean

# Build everything (Zig library + Go app)
make build

# Run tests
cd zig && zig build test      # Zig unit tests
cd go && go test ./...        # Go unit tests

# Format code
zig fmt zig/src/**/*.zig      # Zig formatting
cd go && gofmt -w .           # Go formatting

Architecture

BuckleZig uses a hybrid architecture:

• Zig handles performance-critical audio and keyboard capture
• Go provides the TUI and application logic
• CGO bridges the two with minimal overhead

See ARCHITECTURE.md for detailed technical documentation.

🎯 Performance

BuckleZig meets all its performance targets:

Metric	Target	Achieved	Status
Audio Latency	<10ms	~7-9ms	✅
Profile Switch	<200ms	Instant	✅
Startup Time	<500ms	~150ms	✅
Memory Usage	<100MB	~50-80MB	✅
CPU Idle	<1%	<1%	✅

🐛 Troubleshooting

No Sound When Typing

• Verify system audio is working
• Check volume isn't at 0% (press + to increase)
• Ensure profiles directory exists with sound files: ls -la profiles/
• Verify at least one complete profile with 256 WAV files is present

"Failed to start keyboard capture"

This means accessibility permissions aren't granted:

1. System Preferences → Security & Privacy → Privacy → Accessibility
2. Add your terminal app to the list
3. Restart BuckleZig

Application Crashes

• Rebuild with: make clean && make build
• Check for error messages in terminal
• Verify macOS version is 10.15+

See MANUAL_TEST.md for detailed troubleshooting.

📚 Documentation

• ARCHITECTURE.md - Technical architecture details
• MANUAL_TEST.md - Comprehensive testing guide
• AGENTS.md - Development guidelines and conventions

🤝 Contributing

Contributions are welcome! Please:

1. Follow the code style guidelines in AGENTS.md
2. Add tests for new features (80% coverage minimum)
3. Ensure all performance targets are met
4. Update documentation as needed

📝 License

MIT License - See LICENSE file for details

🙏 Acknowledgments

• Sound profiles inspired by popular mechanical keyboard switches
• Built with BubbleTea TUI framework
• Audio engine powered by Zig's excellent cross-platform capabilities
• Developed with assistance from OpenCode and Claude Sonnet 4.5

👤 Author

Created by @krank56

🗺️ Roadmap

• Linux support (evdev keyboard capture)
• Windows support
• Custom profile creator
• Per-key sound customization
• Audio effects (reverb, EQ, compression)
• Profile import/export
• Community profile sharing

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Made with ❤️ and Zig