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MCP MIDI Server

by sandst1
GitHub
Python
1
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Integrations

  • Enables configuration of the MCP server through environment variables stored in a .env file, allowing users to specify settings like the server port.

  • Provides installation instructions that utilize Git for cloning the repository to set up the MCP MIDI server.

  • Creates a virtual MIDI output port that can send MIDI Note On/Off messages and Control Change (CC) messages with precise timing to any software that supports MIDI input, such as digital audio workstations (DAWs), hardware synthesizers, and other MIDI-compatible applications.

MCP MIDI Server

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:

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 ] # Send to the MCP MIDI Server API

License

MIT

This server cannot be installed

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security - not tested
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license - not found
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quality - not tested

local-only server

The server can only run on the client's local machine because it depends on local resources.

A FastMCP server that creates a virtual MIDI output port, allowing LLMs to generate and send MIDI data to any software that accepts MIDI input.

  1. Features
    1. Requirements
      1. Installation
        1. Usage
          1. MCP Config
            1. API Methods
              1. Send Note On
              2. Send Note Off
              3. Send Control Change
              4. Send MIDI Sequence
            2. Example
              1. License

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