Voicemeeter MCP Server

A Model Context Protocol (MCP) server that provides AI agents with the ability to control and monitor Voicemeeter audio mixer through the Voicemeeter Remote API.

Features

• Full Voicemeeter Control: Connect to and control all versions of Voicemeeter (Standard, Banana, Potato)
• Parameter Management: Get and set any Voicemeeter parameter (mute, gain, routing, etc.)
• Audio Level Monitoring: Real-time audio level monitoring for all channels
• Preset Loading: Load Voicemeeter presets from XML files
• Dynamic Resources: Automatically adapts to the connected Voicemeeter type
• Application Launching: Start Voicemeeter applications programmatically

Supported Voicemeeter Versions

• Voicemeeter Standard: 2 hardware inputs + 1 virtual input, 3 outputs
• Voicemeeter Banana: 3 hardware inputs + 2 virtual inputs, 5 outputs
• Voicemeeter Potato: 5 hardware inputs + 3 virtual inputs, 8 outputs

Installation

Prerequisites

• Python 3.8 or higher
• Voicemeeter installed on Windows
• MCP-compatible client (like Claude Desktop)

Install from Source

git clone <repository-url>
cd voicemeeter-mcp-server
pip install -e .

Install Development Dependencies

pip install -e ".[dev]"

Usage

Running the Server

voicemeeter-mcp-server

Or directly with Python:

python -m voicemeeter_mcp_server.main

MCP Client Configuration

Add to your MCP client configuration (e.g., Claude Desktop):

{
  "mcpServers": {
    "voicemeeter": {
      "command": "voicemeeter-mcp-server",
      "args": []
    }
  }
}

Available Tools

Connection Management

• voicemeeter_connect: Connect to Voicemeeter Remote API
• voicemeeter_disconnect: Disconnect from Voicemeeter Remote API
• voicemeeter_run: Launch Voicemeeter application (standard/banana/potato)

Parameter Control

• voicemeeter_get_parameter: Get any Voicemeeter parameter value
• voicemeeter_set_parameter: Set any Voicemeeter parameter value

Audio Monitoring

• voicemeeter_get_levels: Get real-time audio levels for specified channels

Preset Management

• voicemeeter_load_preset: Load settings from Voicemeeter XML preset files

Available Resources

Static Resources

• voicemeeter://status: Connection status and Voicemeeter type information
• voicemeeter://version: Voicemeeter version and API information
• voicemeeter://levels: Current audio levels for all channels

Dynamic Resources (when connected)

• voicemeeter://strip/{id}: Individual input strip parameters
• voicemeeter://bus/{id}: Individual output bus parameters

Parameter Examples

Common Strip Parameters

Strip[0].mute          # Mute strip 0 (0.0 = unmuted, 1.0 = muted)
Strip[0].gain          # Gain in dB (-60.0 to +12.0)
Strip[0].A1            # Route to Bus A1 (0.0 = off, 1.0 = on)
Strip[0].label         # Strip label (string)
Strip[0].device.name   # Input device name (string)

Common Bus Parameters

Bus[0].mute            # Mute bus 0
Bus[0].gain            # Bus gain in dB
Bus[0].eq.on           # EQ on/off
Bus[1].mono            # Mono mode

Example Usage

Connect and Control

# Connect to Voicemeeter
await mcp_client.call_tool("voicemeeter_connect")

# Mute input strip 0
await mcp_client.call_tool("voicemeeter_set_parameter", {
    "parameter": "Strip[0].mute",
    "value": 1.0
})

# Set gain on bus 1
await mcp_client.call_tool("voicemeeter_set_parameter", {
    "parameter": "Bus[1].gain", 
    "value": -6.0
})

# Get current levels
await mcp_client.call_tool("voicemeeter_get_levels", {
    "level_type": 0,
    "channels": [0, 1, 2, 3]
})

Load Preset

# Load a preset configuration
await mcp_client.call_tool("voicemeeter_load_preset", {
    "preset_path": "C:/path/to/preset.xml"
})

Development

Project Structure

voicemeeter-mcp-server/
├── src/
│   └── voicemeeter_mcp_server/
│       ├── __init__.py
│       ├── main.py           # Entry point
│       ├── server.py         # MCP server implementation
│       └── voicemeeter_api.py # Voicemeeter API wrapper
├── tests/                    # Test files
├── presets/                  # Example presets
├── samples/                  # Documentation and samples (not in git)
├── pyproject.toml           # Project configuration
└── README.md

Running Tests

pytest

Code Formatting

black src/ tests/
isort src/ tests/

Type Checking

mypy src/

API Reference

Voicemeeter Remote API

This server wraps the official Voicemeeter Remote API. For detailed parameter documentation, refer to:

• Voicemeeter Remote API documentation (included in samples/)
• Official Voicemeeter website

Level Types

• 0: Input levels (pre-fader)
• 1: Output levels (pre-fader)
• 2: Output levels (post-fader)
• 3: Output levels (post-mute)

Troubleshooting

Automated Troubleshooting

Run the comprehensive troubleshooting script:

python troubleshoot.py

This script will:

• Check system architecture and Python version
• Verify Voicemeeter processes are running
• Test DLL loading and API functions
• Provide detailed diagnostic information

Common Issues

1. "Failed to connect to Voicemeeter"

   • Ensure Voicemeeter is installed and running
   • Try running as administrator
   • Check that no other applications are using the Remote API

2. "Failed to load DLL"

   • Verify Voicemeeter installation
   • Check if running 32-bit vs 64-bit Python matches Voicemeeter version

3. Parameter not found

   • Verify parameter name syntax: Strip[0].mute, Bus[1].gain
   • Check if parameter exists for your Voicemeeter version
   • Some parameters are version-specific

Debug Mode

Set environment variable for verbose logging:

set VOICEMEETER_DEBUG=1
voicemeeter-mcp-server

Audio Test Samples

Generate audio test files for testing Voicemeeter functionality:

python generate_audio_samples.py

This creates various test files in audio_samples/:

• Basic tones: 440Hz, 100Hz, 8kHz test tones
• Stereo test: Different frequencies in left/right channels
• Frequency sweep: 20Hz to 20kHz sweep for frequency response testing
• Channel identification: Individual tones for multi-channel testing
• White noise: For general audio testing

Use these files to:

• Test audio routing through Voicemeeter
• Verify real-time level monitoring
• Check stereo separation
• Test parameter changes while audio is playing

Author

rkzwei (rk@rkzwei.dev)

• GitHub: @rkzwei
• Original author and maintainer of Voicemeeter MCP Server

License

MIT License - see LICENSE file for details.

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests if applicable
5. Run the test suite
6. Submit a pull request

Acknowledgments

• VB-Audio Software for Voicemeeter and the Remote API
• Anthropic for the Model Context Protocol specification
• The MCP community for tools and examples