PostFader

Name: PostFader
Author: synopsys0

by synopsys0version 12.0.3i★ –iRuns on your computer

Registry nameio.github.synopsys0/postfader-fl-studio-mcp

Install

Overview

Description from the maker (original English)

FL Studio MCP server: read, mix, compose, and edit your open FL Studio project from any MCP client.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other
You need to fill in: FL_BRIDGE_ENABLE_MIDI, FL_BRIDGE_MIDI_PORT, FL_STUDIO_USER_DATA_DIR

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: FL_BRIDGE_ENABLE_MIDI, FL_BRIDGE_MIDI_PORT, FL_STUDIO_USER_DATA_DIR

You need

PyPIPython’s uv installed (for the uvx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "postfader-fl-studio": {
      "command": "uvx",
      "args": [
        "postfader-fl-studio-mcp"
      ],
      "env": {
        "FL_BRIDGE_ENABLE_MIDI": "your-value",
        "FL_BRIDGE_MIDI_PORT": "your-value",
        "FL_STUDIO_USER_DATA_DIR": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add postfader-fl-studio --env FL_BRIDGE_ENABLE_MIDI=your-value --env FL_BRIDGE_MIDI_PORT=your-value --env FL_STUDIO_USER_DATA_DIR=your-value -- uvx postfader-fl-studio-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "postfader-fl-studio": {
      "command": "uvx",
      "args": [
        "postfader-fl-studio-mcp"
      ],
      "env": {
        "FL_BRIDGE_ENABLE_MIDI": "your-value",
        "FL_BRIDGE_MIDI_PORT": "your-value",
        "FL_STUDIO_USER_DATA_DIR": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "postfader-fl-studio": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "postfader-fl-studio-mcp"
      ],
      "env": {
        "FL_BRIDGE_ENABLE_MIDI": "your-value",
        "FL_BRIDGE_MIDI_PORT": "your-value",
        "FL_STUDIO_USER_DATA_DIR": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

FL_BRIDGE_ENABLE_MIDI required env
Set to 1 to build the MIDI SysEx transport. Without it the server cannot reach FL Studio.
FL_BRIDGE_MIDI_PORT required env
Exact virtual MIDI endpoint name shared with FL Studio. PostFader does not install or configure a virtual MIDI provider.
FL_STUDIO_USER_DATA_DIR required env
Absolute FL Studio user-data directory containing Settings/Hardware.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account synopsys0, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32606 servers in this category
Published to the registry more recently than 55% of the other 32606 servers in this category
Basic checks equal to or better than 100% of the other 32606 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is PostFader safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: FL_BRIDGE_ENABLE_MIDI, FL_BRIDGE_MIDI_PORT, FL_STUDIO_USER_DATA_DIR

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (12.0.3) reached the registry 33 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Georgia MCP

Alternatives

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

PostFader: FL Studio MCP Server

Let Claude, Codex, Cursor, or any MCP client work inside the FL Studio project you have open.

Quick start · What it does · Why PostFader · Docs · FAQ

Free and open source. Unofficial: not made by or affiliated with Image-Line.

PostFader is an FL Studio MCP server. It connects your AI assistant to the project you already have open, so the AI can read your mixer, channels, plug-ins and patterns, check your exported mix, write MIDI, and make changes for you. Every supported change is read back from FL Studio, so you see what actually happened.

It runs on your computer. There is no PostFader account, cloud service, or telemetry.

What you can ask for

	Ask your AI	What PostFader does
🔎 Understand a project	"Which instruments aren't routed to the mixer?"	Reads routing, effects, channels, patterns, Playlist tracks, and plug-in parameters.
🩺 Fix a mix	"What are the three biggest problems in this bounce?"	Measures loudness, peaks, tonal balance, stereo width, and vocal masking in the files you export, and compares them with a reference.
🎛️ Change the session	"Pan the backing vocals wider and pull the reverb send down 3 dB."	Sets faders, pan, sends, routing, names, colors, tempo, transport, and any parameter a loaded plug-in exposes, then reads each one back.
🎹 Write music	"Add an 8-bar D Dorian bassline under my chords."	Generates chords, melodies, basslines, and drums; writes them to the Piano Roll or exports MIDI files.
🎚️ Pick sounds	"Choose the sounds yourself from what's loaded."	Picks presets on the instruments in your project and confirms each selection.
🧱 Run a whole task	"Turn this loop into a 16-bar draft, but keep my vocal."	Runs the job as a checked plan you can resume. Export a bounce and it can review the draft and plan one revision.

Browse all 85 tools in the tool reference.

Quick start

You need: FL Studio 2026 (26.1.3 or newer) on Windows or macOS, Python 3.10 to 3.14, and a virtual MIDI port: the built-in IAC Driver on macOS, or a free app such as loopMIDI on Windows.

Run the installer. Download the Windows or macOS ZIP from the latest release, extract it, and run the installer inside. It installs PostFader, copies the bridge script into FL Studio, and asks which MIDI port to use.
In FL Studio, open *Options → MIDI settings*. Enable your virtual port as both input and output, set the input's controller type to Universal Bridge, and give both the same port number.
Connect your AI client with the configuration the installer prints (see Works with).
Ask a question first, like *"Summarize my project."* PostFader starts read-only, so nothing changes until you ask for an edit.

Using Python directly? Run pip install postfader-fl-studio-mcp, then postfader setup. The setup guide covers every option, and postfader-doctor pinpoints anything that isn't connected.

How it works

FL Studio only runs scripts from inside itself, so PostFader talks to a small controller script, the Universal Bridge, over a virtual MIDI port. Audio analysis works on files you export, because FL Studio doesn't expose its live output to scripts.

Why PostFader

Nothing changes until you ask. PostFader starts read-only. Edits need write mode, which the AI turns on for your session only when you ask for a change. Reloading the project turns it off again.
Changes are checked, not assumed. After each supported edit, PostFader reads the value back from FL Studio and reports what actually happened.
Your project is never saved for you. You decide when to save, and FL Studio's undo history keeps working.
It checks your mix, not just your settings. Mix Doctor, loudness and true-peak checks, reference comparison, and vocal masking run on the bounces you choose.
It doesn't crowd your AI's context. Detailed plan formats load only when the AI needs them, leaving room for your conversation.
Windows and macOS, tested on both. Every change runs the full test suite on both systems before release.

See how PostFader compares with other FL Studio MCP servers →

Works with

PostFader is a local MCP server, so your AI client must run on the same computer as FL Studio. postfader setup prints ready-to-paste configuration.

Client	How to connect
Claude Desktop	Paste the generated `claude-json` config, or install the `.mcpb` extension from the release page.
Claude Code	`claude mcp add-json fl-studio ' '`
Codex (CLI, IDE, app)	Run the Codex installer ZIP, or `postfader setup --client codex-toml --register-codex`.
Cursor	Paste the `claude-json` entry into `~/.cursor/mcp.json`.
Other MCP clients	Any client that can launch a local stdio server. Use the same command, arguments, and environment.

Documentation

Guide	What's in it
Setup and troubleshooting	Installers, MIDI settings, every client, upgrades, and the doctor
Tool reference	All 85 tools and 8 resources, grouped by task
FAQ	Short answers to common questions and problems
Comparison	PostFader next to other FL Studio MCP servers and Gopher
Production Runs	Multi-step jobs, resuming, and stopping
Creation Review	Reviewing a draft bounce, revising it, and preparing delivery
Sound Selection	How PostFader picks presets from loaded instruments
Plug-in support	Parameter control, presets, and compatibility reports
FL Studio limits	What FL Studio's scripting API can't do
Security and privacy	What runs where, and how to report a vulnerability
All documentation	Architecture, contracts, release notes, and more

FAQ

What is an FL Studio MCP server?

MCP (Model Context Protocol) is the open standard AI assistants use to call tools. An FL Studio MCP server gives the assistant tools for FL Studio, so it can read and change your project instead of only describing what to click.

Which FL Studio versions work?

FL Studio 2026, version 26.1.3 build 5336 or newer. Older builds are refused because they lack MIDI-scripting fixes PostFader relies on.

Do I need loopMIDI?

On Windows you need one virtual MIDI port; loopMIDI is a common free choice. On macOS, enable the built-in IAC Driver in Audio MIDI Setup.

Can it hear my song?

It analyzes audio files you export. FL Studio doesn't give scripts access to its live output, so PostFader can't listen in real time.

Can it load plug-ins?

On macOS, yes: it adds instruments and effects from FL Studio's Add menu (this needs Accessibility access). On Windows, load them yourself; PostFader can then control their parameters.

Will it mess up my project?

It starts read-only, checks every supported change, and never saves. Use FL Studio's undo if you don't like an edit, and try your first edits on a copy.

Contributing and security

Bug reports, plug-in compatibility results, and pull requests are welcome; see CONTRIBUTING.md and GitHub Discussions. Report vulnerabilities privately as described in SECURITY.md.

PostFader is licensed under the Apache License 2.0. FL Studio is a trademark of Image-Line, which does not make or endorse this project.

PostFader

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Georgia MCP

README from the maker

PostFader: FL Studio MCP Server

What you can ask for

Quick start

How it works

Why PostFader

Works with

Documentation

FAQ

What is an FL Studio MCP server?

Which FL Studio versions work?

Do I need loopMIDI?

Can it hear my song?

Can it load plug-ins?

Will it mess up my project?

Contributing and security