WetDelay

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WET VST - Open source stereo delay VST3 plugin with authentic 80s rack-style character. 12-bit quantization, 24kHz internal rate, channel crosstalk. Windows/Linux/Mac VST3.

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# WET Delay VST3 Plugin

![Build Status](https://img.shields.io/badge/build-passing-brightgreen)
![VST3](https://img.shields.io/badge/VST3-Compatible-blue)
![Platform](https://img.shields.io/badge/platform-Windows%20%7C%20Linux%20%7C%20macOS-lightgrey)
![Version](https://img.shields.io/badge/version-1.1.0-orange)

A professional stereo delay VST3 plugin with authentic 80s rack-style digital delay character.

![WetDelay Plugin Screenshot](https://raw.githubusercontent.com/yonie/WetDelay/main/screenshot.png)

## Features

- **100% Wet Delay**: Pure delayed signal output with no dry signal mix
- **6 Delay Times**: Switchable delay times (20ms, 40ms, 80ms, 120ms, 220ms, 400ms)
- **Stereo Processing**: Independent left and right channel delay processing
- **Visual Metering**: Real-time peak level meters for input and output
- **VST3 Automation**: Full parameter automation support in DAWs

### 80s Rack-Style Character

- **24 kHz Internal Sample Rate**: Authentic vintage digital delay processing with band-limited frequency response
- **12-bit Quantization**: Classic gritty digital character with 4096 discrete levels
- **TPDF Dither**: Smooth quantization with triangular probability density function dither (0.5 LSB)
- **Vintage Filtering**: 80 Hz high-pass and 9 kHz low-pass (6 dB/oct) for warm character
- **Channel Crosstalk**: Authentic -40 dB (1%) L/R channel bleed simulating analog circuitry

## Download & Installation

### Windows

1. **Download** the latest release from [GitHub Releases](https://github.com/yonie/WetDelay/releases)
2. **Extract** the ZIP file
3. **Copy** `WetDelay.vst3` to your VST3 folder:
   - User: `C:\Users\[Username]\Documents\VST3\`
   - System: `C:\Program Files\Common Files\VST3\`
4. **Restart your DAW** and rescan plugins

### Linux

1. **Download** the latest release from [GitHub Releases](https://github.com/yonie/WetDelay/releases)
2. **Extract** the ZIP file
3. **Copy** `WetDelay.vst3` to your VST3 folder:
   - User: `~/.vst3/`
   - System: `/usr/lib/vst3/`
4. **Restart your DAW** and rescan plugins

### macOS

1. **Download** the latest release from [GitHub Releases](https://github.com/yonie/WetDelay/releases)
2. **Extract** the ZIP file
3. **Copy** `WetDelay.vst3` to your VST3 folder:
   ```
   ~/Library/Audio/Plug-Ins/VST3/
   ```
4. **Remove quarantine attribute** (see below)
5. **Restart your DAW** and rescan plugins

Note that by default, the Library folder may not be shown in the Finder. See the macOS documentation on how to make it visible.

#### ❗️ macOS Security Notice

macOS may block the plugin because it's unsigned. This **does not mean** the plugin is unsafe.

**Remove quarantine attribute:**

```bash
xattr -rd com.apple.quarantine ~/Library/Audio/Plug-Ins/VST3/WetDelay.vst3
```

**What this command does:**
- `xattr` = extended attribute tool
- `-r` = recursive (process all files in the bundle)
- `-d` = delete the specified attribute
- `com.apple.quarantine` = the quarantine attribute

Restart your DAW after running the command.

#### Why macOS Blocks This Plugin

When you try to load the plugin in your DAW, you may see an error:

> "WetDelay.vst3" cannot be opened because the developer cannot be verified.

This **does not mean** the plugin contains malware or is unsafe.

This is due to **Apple's security policy**, which requires developers to:
- Enroll in the Apple Developer Program
- Pay **$99/year** for a developer certificate
- Notarize each build with Apple

As an independent developer releasing **free, open-source software** under the MIT license, I currently don't have the budget for Apple's developer program. The complete source code is available on GitHub for anyone to inspect and build themselves.

This is a common issue with free audio plugins on macOS. You'll encounter the same message with many free, open-source VSTs.

## Usage

1. **Load the plugin** in your DAW (Reaper, Cubase, Ableton Live, FL Studio, etc.)
2. **Select delay time** using the Delay Time parameter (0-5 for 6 positions)
3. **Monitor levels** using the built-in input/output meters
4. **Automate** the delay time parameter for creative effects

### Parameter Reference

| Parameter | Range | Default | Description |
|-----------|-------|---------|-------------|
| Delay Time | 0-5 | 0 | Selects delay time: 0=20ms, 1=40ms, 2=80ms, 3=120ms, 4=220ms, 5=400ms |

### Delay Times

| Position | Delay Time |
|----------|------------|
| 0 | 20 ms |
| 1 | 40 ms |
| 2 | 80 ms |
| 3 | 120 ms |
| 4 | 220 ms |
| 5 | 400 ms |

---

## Building from Source

If you want to build the plugin yourself, follow these instructions.

### System Requirements

#### Windows
- **Operating System**: Windows 10/11 (64-bit)
- **Build Tools**: 
  - Visual Studio 2022 Build Tools or Community Edition
  - CMake 3.15 or higher
  - Git

#### Linux
- **Operating System**: Linux (x86_64)
- **Build Tools**:
  - GCC or Clang with C++17 support
  - CMake 3.15 or higher
  - Git
- **Dependencies** (Ubuntu/Debian):
  ```
  sudo apt-get install cmake gcc g++ libstdc++6 libx11-xcb-dev libxcb-util-dev \
      libxcb-cursor-dev libxcb-xkb-dev libxkbcommon-dev libxkbcommon-x11-dev \
      libfontconfig1-dev libcairo2-dev libgtkmm-3.0-dev libsqlite3-dev \
      libxcb-keysyms1-dev git
  ```

#### macOS
- **Operating System**: macOS 10.13 or higher (Intel) / macOS 11.0 or higher (Apple Silicon)
- **Build Tools**:
  - Xcode Command Line Tools or Xcode
  - CMake 3.15 or higher
  - Git

### Step 1: Clone VST3 SDK

If the `vst3sdk` folder is not present, clone it:

```batch
git clone --recursive https://github.com/steinbergmedia/vst3sdk.git
```

### Step 2: Build

#### Windows
Run the automated build script:

```batch
build.bat
```

This will:
- Configure CMake for Visual Studio 2022
- Build the plugin in Release mode
- Run the VST3 validator (47 automated tests)
- Output: `WetDelay\build\VST3\Release\WetDelay.vst3`

#### Linux
Run the automated build script:

```bash
chmod +x build.sh
./build.sh
```

This will:
- Configure CMake with GCC/Clang
- Build the plugin in Release mode
- Run the VST3 validator (47 automated tests)
- Output: `WetDelay/build/VST3/Release/WetDelay.vst3`

#### macOS
Run the automated build script:

```bash
chmod +x build.sh
./build.sh
```

This will:
- Configure CMake with Clang
- Build the plugin in Release mode
- Run the VST3 validator (47 automated tests)
- Output: `WetDelay/build/VST3/Release/WetDelay.vst3`

### Step 3: Install

#### Windows
To install the plugin to your system's VST3 folder:

```batch
install.bat
```

**Note**: You may need to run as Administrator if you encounter permission errors.

#### Linux
To install the plugin to your user VST3 folder:

```bash
chmod +x install.sh
./install.sh
```

This installs to `~/.vst3/WetDelay.vst3`

#### macOS
To install the plugin to your user VST3 folder:

```bash
chmod +x install.sh
./install.sh
```

This installs to `~/Library/Audio/Plug-Ins/VST3/WetDelay.vst3`

---

## Technical Details

### Architecture

- **Framework**: VST3 SDK (Official Steinberg)
- **Language**: C++17
- **Build System**: CMake (MSBuild on Windows, Make on Linux)
- **GUI**: VSTGUI4

### Audio Processing

- **Host Sample Rates**: Supports 22.05 kHz to 384 kHz
- **Internal Sample Rate**: 24 kHz (80s rack-style)
- **Host Bit Depth**: 32-bit float processing
- **Internal Bit Depth**: 12-bit quantization with dither
- **Latency**: User-controlled (20-400ms delay)
- **CPU Usage**: <0.5% (typical)
- **Memory**: ~200 KB

### Implementation Details

- **Delay Engine**: Circular buffer at 24 kHz internal rate
- **Resampling**: Linear interpolation with anti-aliasing and reconstruction filters
- **Quantization**: 12-bit uniform quantization with TPDF dither
- **Filtering**: 1st-order high-pass (80 Hz) and low-pass (9 kHz)
- **Crosstalk**: 1% (-40 dB) bidirectional channel bleed
- **Metering**: Atomic peak detection with exponential decay
- **Thread Safety**: Lock-free atomic operations for GUI communication
- **Buffer Size**: Pre-allocated for 400ms @ internal sample rate

## Project Structure

```
WetDelay/
├── vst3sdk/                    # VST3 SDK (git submodule)
├── WetDelay/                   # Plugin source
│   ├── source/
│   │   ├── wetdelayprocessor.h/cpp    # Audio processing
│   │   ├── wetdelaycontroller.h/cpp   # Parameter control
│   │   ├── delaybuffer.h/cpp          # Delay buffer implementation
│   │   ├── wetdelaycids.h             # Plugin IDs
│   │   └── version.h                  # Version info
│   ├── resource/
│   │   └── wetdelayeditor.uidesc      # GUI definition
│   ├── CMakeLists.txt                 # Build configuration
│   └── build/                         # Build output (generated)
├── build.bat                   # Build automation script
├── install.bat                 # Installation script
├── LICENSE                     # MIT License
└── README.md                   # This file
```

## Validation Results

The plugin passes all official VST3 validation tests:

✅ **47 tests passed, 0 tests failed**

Key validations:
- Valid state transitions
- Proper bus configuration
- Correct parameter handling
- Sample rate support (22.05 kHz - 384 kHz)
- Thread safety
- Preset save/load
- Plugin suspend/resume

## Troubleshooting

### macOS Issues

**Plugin not appearing in DAW:**
- You forgot to remove the quarantine attribute - see Installation section above
- Restart your DAW after running the `xattr` command
- Check VST3 scan path: `~/Library/Audio/Plug-Ins/VST3/`
- Verify the folder contains `WetDelay.vst3`

**Still getting "cannot be verified" after running xattr:**
- Right-click the plugin → "Open" → "Open" to bypass Gatekeeper
- Check DAW console for error messages
- Report issue at [GitHub Issues](https://github.com/yonie/WetDelay/issues)

**Plugin crashes DAW:**
- macOS 10.13+ (Intel) or macOS 11.0+ (Apple Silicon) required
- Check DAW console for error messages
- Report issue at [GitHub Issues](https://github.com/yonie/WetDelay/issues)

### Runtime Issues

**No sound output:**
- Verify the plugin is receiving audio input
- Check that the delay time is not set to minimum (varies by sample rate)
- Ensure your DAW is routing through the plugin correctly

**Crackling/Clicking:**
- This shouldn't occur with discrete parameter changes
- If it does, report as a bug with your DAW and sample rate info

## Author

**Ronald Klarenbeek**
- Website: [https://wetvst.com](https://wetvst.com)
- Email: contact@wetvst.com
- GitHub: [https://github.com/yonie](https://github.com/yonie)

## License

This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

**Note:** This project uses the VST3 SDK which is licensed under a BSD-style license.
See the VST3 SDK license files for details on SDK licensing.

## Acknowledgments

- Steinberg Media Technologies for the VST3 SDK
- VSTGUI framework for cross-platform GUI support
- The audio plugin development community

## Version History

### v1.1.3 (2026-03-28)
- Fixed a bug where the selected delay time was not remembered across DAW sessions

### v1.1.0 (2026-03-09)
- **Multi-Platform Support**:
  - Universal VST3 bundle for Windows (x64), Linux (x86_64), and macOS (Intel x86_64 + Apple Silicon arm64)
  - GitHub Actions CI/CD for automated cross-platform builds
  - Single download contains all platform binaries

### v1.0.0 (2026-01-07)
- Initial release
- Core stereo delay functionality
- 6 fixed delay times (20-400ms)
- 100% wet output
- Input/output peak metering
- Full VST3 automation support
- Validated with official VST3 validator
- **80s Rack-Style Character**:
  - 24 kHz internal sample rate with resampling
  - 12-bit quantization (4096 levels)
  - TPDF dither for smooth quantization
  - Anti-aliasing and reconstruction filters
- **Channel Crosstalk**:
  - Authentic -40 dB (1%) L/R channel bleed
  - Simulates analog circuitry imperfections

---

**Built with ❤️ and precision engineering**

## Support

If you find this plugin helpful, consider buying me a coffee!

[![Buy Me A Coffee](https://img.shields.io/badge/Buy%20Me%20A%20Coffee-support-yellow?style=flat&logo=buy-me-a-coffee)](https://buymeacoffee.com/yonie)

WetDelay

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