MCP MIDI Server
About
A MCP Server for sending MIDI sequences to any program that supports MIDI input
Explore
- Creates a virtual MIDI output port
- Sends MIDI Note On/Off messages
- Sends Control Change (CC) messages
- Sequences MIDI events with precise timing
- Can be used as a MIDI input device in any application that supports MIDI
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
MCP MIDI ServerCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
- Python 3.7+
- rtmidi
- fastmcp
- python-dotenv
- asyncio
The server uses Server-Sent Events (SSE), this is how to config it in Cursor:
{
"mcpServers": {
"midi": {
"url": "http://localhost:8123/sse"
}
}
}
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"mcp midi server": {
"midi": {
"url": "http://localhost:8123/sse"
}
}
}
}McpServers
{
"midi": {
"url": "http://localhost:8123/sse"
}
}A FastMCP Server which allows an LLM to send MIDI sequences into any software that supports MIDI input.
Features
- Creates a virtual MIDI output port
- Sends MIDI Note On/Off messages
- Sends Control Change (CC) messages
- Sequences MIDI events with precise timing
- Can be used as a MIDI input device in any application that supports MIDI
Requirements
- Python 3.7+
- rtmidi
- fastmcp
- python-dotenv
- asyncio
Installation
1. Clone the repository:
git clone <repository-url>
cd mcp-server-midi
2. Create a virtual env, activate it and install dependencies:
python -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt
3. Create a .env file with your configuration:
PORT=8123
Usage
Run the server:
python mcp_midi_server.py
The server creates a virtual MIDI port named "MCP MIDI Out" that can be used as a MIDI input device in other applications. This means you can:
- Connect digital audio workstations (DAWs) like Ableton Live, Logic Pro, or FL Studio to receive MIDI from this server
- Use the server to control hardware synthesizers through your computer's MIDI interface
- Connect to any other software that accepts MIDI input (virtual instruments, lighting controllers, etc.)
Simply select "MCP MIDI Out" as a MIDI input device in your preferred MIDI-compatible application.
MCP Config
The server uses Server-Sent Events (SSE), this is how to config it in Cursor:
{
"mcpServers": {
"midi": {
"url": "http://localhost:8123/sse"
}
}
}
API Methods
Send Note On
Sends a MIDI Note On message.
Parameters:
- note: MIDI note number (0-127)
- velocity: Note velocity (0-127, default 127)
- channel: MIDI channel (0-15, default 0)
Send Note Off
Sends a MIDI Note Off message.
Parameters:
- note: MIDI note number (0-127)
- velocity: Note off velocity (0-127, default 64)
- channel: MIDI channel (0-15, default 0)
Send Control Change
Sends a MIDI Control Change (CC) message.
Parameters:
- controller: CC controller number (0-127)
- value: CC value (0-127)
- channel: MIDI channel (0-15, default 0)
Send MIDI Sequence
Sends a sequence of MIDI Note On/Off messages with specified durations.
Parameters:
- events: A list of event dictionaries. Each dictionary must contain:
- note: MIDI note number (0-127)
- velocity: Note velocity (0-127, default 127)
- channel: MIDI channel (0-15, default 0)
- duration: Time in seconds to hold the note before sending Note Off
- start_time: Time in seconds when to start the note, relative to sequence start (default 0)
Example
Using the API to play a C major chord:
```python
events = [
{"note": 60, "velocity": 100, "duration": 1.0, "start_time": 0.0}, # C4
{"note": 64, "velocity": 100, "duration": 1.0, "start_time": 0.0}, # E4
{"note": 67, "velocity": 100, "duration": 1.0, "start_time": 0.0}, # G4
]
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