Freesound MCP server

Based on the freesound API on https://github.com/MTG/freesound-python

DISCLAIMER: be careful about prompt-injection, there is no input sanitization or validation

Demo

Check a demostration here https://youtu.be/YVC5r43rQIg

First improve the prompt, LLMs + MCP to iterate the search for sounds in the sound database (Freesound.org). Then, generate code to render sound in Supercollider and create visuals for the browser:

0:00 - Assistant message in Calliope
0:09 - Initial prompt for the sound work (textual description)
6:25 - Final prompt for the sound work (textual description)
6:32 - Searching for samples using prompts and MIR functions    
9:00 - Building the code in Supercollider to render sound
10:50 - Creating visuals to accompany the work
13:04 - Iteration to change the violin sounds for others
13:58 - Final Supercollider script with sample comparison
14:15 - Setting visual preferences
14:25 - Playing the work: sound + visuals (3 minutes long)

MCP config

Dependencies

pip install poetry
poetry install --no-root # package-mode false

Create .env file with your Freesound API KEY

FREESOUND_API_KEY=

Edit your llm config file like this

For exmple ~/Library/Application\ Support/Claude/claude_desktop_config.json

{
"mcpServers": {
    "freesound": {
    "command": "uv",
    "args": [
        "--directory",
        "$YOUR-PATH/freesound-mcp-server",
        "run",
        "mcp_freesound.py"
    ]
    },
}

Run Supercollider server like this

( s.waitForBoot { // SynthDef that plays a buffer SynthDef(\playSample, { arg buf; var sig; sig = PlayBuf.ar(1, buf, doneAction: 2); Out.ar(0, sig); }).add;

// Declare a dictionary to keep track of loaded buffers
~buffers = IdentityDictionary.new;

// OSC handler
OSCdef(\play_sound, { |msg|
    var path, buf;

    path = msg[1];
    postln("Received /play_sound for: " ++ path);

    // Avoid reloading if already in memory
    if (~buffers[path].notNil) {
        Synth(\playSample, [\buf, ~buffers[path].bufnum]);
    } {
        // Load and play buffer
        Buffer.read(s, path, action: { |b|
            ~buffers[path] = b;
            Synth(\playSample, [\buf, b.bufnum]);
        });
    };
}, '/play_sound');

postln("OSC handler for /play_sound is ready.");

}; )