postfader-fl-studio-mcp

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# PostFader

**The AI copilot for FL Studio**

## Your AI can finally work inside FL Studio.

PostFader connects Claude, Codex, Cursor, and other local MCP-compatible AI
clients to the FL Studio project you already have open. Ask it to inspect your
session, diagnose a mix, control loaded plug-ins, clean up routing, build MIDI
parts, organize patterns and Playlist tracks, add section markers, or make
supported changes from natural language.

[**Download for Windows**](https://github.com/synopsys0/postfader-fl-studio-mcp/releases/latest/download/PostFader-v0.20.0-Windows.zip)
·
[**Download for macOS**](https://github.com/synopsys0/postfader-fl-studio-mcp/releases/latest/download/PostFader-v0.20.0-macOS.zip)
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[Explore what PostFader can do](#not-just-another-note-sender)

**90 tools · 8 live resources · Windows and macOS · Open source · No PostFader account**

Starts read-only and never saves your project automatically.

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> [!NOTE]
> PostFader is an unofficial community project. It is not made by or affiliated
> with Image-Line.

## Not just another note sender

PostFader is a production layer for FL Studio—not only a way to send notes or
change isolated controls. It gives your AI useful context from the project that
is open now, plus tools to analyze exported audio, work with loaded plug-ins,
compose musical parts, and carry separately requested supported changes back
into the session.

- **Understand the project.** Inspect mixer inserts and routing, Channel Rack
  generators, loaded effects, patterns, Playlist tracks, transport, undo/redo
  history position, step sequences, and plug-in parameters exposed by FL
  Studio.
- **Diagnose the mix.** Measure an exported bounce, compare it with a reference,
  examine vocal-versus-instrument masking, monitor peaks during playback, and
  surface severity, confidence, and scored evidence so your AI can prioritize
  the next moves.
- **Control the session.** Rename and color tracks, adjust levels and panning,
  manage sends and routing, control transport, organize channels and patterns,
  edit steps, and change supported parameters on plug-ins already loaded.
- **Create and transform music.** Generate chords, melody, bass, and drums;
  export multi-track Type-1 MIDI; estimate tempo and key; transcribe monophonic
  audio; and prepare or transform Piano Roll material.

## Four ways to work with PostFader

### Understand the project already open

> “Show me every instrument that is not routed to the mixer.”
>
> “Which effects are loaded on my lead vocal?”
>
> “Where are my drums routed, and which mixer inserts are peaking too high?”

PostFader reads FL Studio's current project state: mixer inserts and sends,
loaded mixer effects, Channel Rack generators, patterns, Playlist track state,
transport, undo/redo history bounds, the current step grid, and exposed plug-in
parameters. Your AI can answer from the actual session instead of relying on a
project description pasted into chat.

### Diagnose an exported mix and decide what to improve

> “What are the three highest-impact problems in this bounce?”
>
> “Compare this mix with my reference and explain the biggest differences.”
>
> “Check these vocal and instrumental exports for likely masking.”

Mix Doctor turns an exported bounce into producer-readable technical findings
about level, dynamics, tonal balance, stereo behavior, and export readiness.
Reference analysis compares loudness and tonal balance across aligned audio.
Masking analysis uses synchronized vocal and instrumental renders to report
possible spectral-overlap regions.

During a chosen observation window, a peak watch samples the mixer inserts
included in the watch and remembers the highest level it observed for each.
Use those results to build a gain-staging plan from a playback section or full
pass that fits the window rather than a single instant. These are sampled
observations, so they do not prove that every transient was captured. Your AI
can use other reported findings to create a separate, reviewable mix plan.

### Control the session and the plug-ins you already use

> “Rename insert 4 to Lead Vocal, color it purple, pan it 10% left, and confirm
> the changes.”
>
> “Mute the backing-vocal tracks and lower the send to the reverb bus.”
>
> “Find the feedback parameter on the delay that is already loaded and reduce
> it.”

PostFader can control mixer volume, pan, mute, solo, arm, selection, stereo
separation, sends, and routing. It can change tempo, playback, loop mode,
recording state, and song position; organize channels, patterns, and Playlist
tracks; and edit step sequences.

For loaded effects and Channel Rack generators, PostFader asks FL Studio which
parameters the plug-in exposes. It can inspect names and values, search or scan
large parameter surfaces within explicit limits, set a known value, target the
number a plug-in displays, or choose an exact named option. Bundled profiles
for selected FL Studio stock effects add known parameter roles for supported
workflows without pretending every plug-in has the same controls.

For those selected profiles, your AI can turn supported goals such as “tame
harshness,” “control dynamics,” “limit peaks,” “shorten the reverb,” or “create
a rhythmic echo” into matching parameter roles. Intent resolution is read-only;
choosing values and applying a change remain separate steps.

PostFader works with the chain already in the session. It does not currently
insert, remove, or reorder plug-ins, and FL Studio does not expose reliable
effect-slot bypass or wet/dry control here.

### Compose, transform, and organize musical ideas

> “Create an eight-bar D Dorian melody with a bassline and drum pattern.”
>
> “Transpose this Piano Roll part up an octave and humanize the velocities.”
>
> “Estimate the tempo and key of this sample.”
>
> “Transcribe this monophonic melody into a reviewable note sequence.”

Generate deterministic chord progressions, melodies, bass parts, and drums from
a musical brief; melody, bass, and drum generation also accept reproducible
seeds. Export separate parts in one Type-1 MIDI file and verify the written
file's structure and content digest. Audio tools can estimate tempo and a global
major or minor key, while monophonic transcription creates a note sequence that
can be reviewed and exported in a separate step.

PostFader can also find and prepare a pattern FL Studio reports as empty, add
section markers, organize Playlist tracks, record a supported automation value,
and prepare Piano Roll append, replace, quantize, transpose, humanize,
duplicate, delete, or clear operations. Piano Roll application uses FL Studio's
separate script workflow, so PostFader reports the evidence it actually has
instead of claiming controller-side note readback.

## From one request to a complete production workflow

### You ask

> “The vocal feels buried. Find the most likely cause, show me what you would
> change, and fix only the highest-confidence problem.”

### PostFader workflow

1. Reads the mixer, routing, and relevant loaded plug-ins.
2. Analyzes the bounce or synchronized renders you provide.
3. Reports possible level, tonal, dynamics, or synchronized-input masking
   findings.
4. Your AI prioritizes the reported evidence and builds a reviewable plan from
   supported operations.
5. Keeps the plan separate until you choose to proceed with the apply call.
6. After you explicitly confirm that you are present and enable session writes,
   sends the separate apply request.
7. Reports the observed result and any evidence limitation.

**Read the project → analyze the bounce → identify the problem → propose a plan
→ choose the change → make a separate apply request → report the result**

A narrow remote control stops at individual commands. PostFader connects those
commands into a production workflow.

## Feature depth

### Mix and finish

- Run Mix Doctor on an exported bounce.
- Compare loudness and tonal balance when candidate and reference inputs align
  and pass readiness checks.
- Examine synchronized vocal and instrumental renders for possible spectral
  overlap.
- Measure peaks, loudness, dynamics, tonal balance, and stereo behavior.
- Watch sampled mixer peaks during a chosen observation window and build
  gain-staging plans.
- Run a finish assessment and use your AI to turn selected recommendations into
  reviewable one-shot plans.

### Control the session

- Work with mixer inserts, sends, routing, and transport.
- Inspect and organize Channel Rack generators, patterns, and Playlist tracks.
- Read undo/redo history bounds and edit the current step sequence.
- Discover and control supported parameters exposed by loaded effects and
  generators.

### Create music

- Generate deterministic chord progressions; melody, bass, and drums also
  accept reproducible seeds.
- Export multi-track Type-1 MIDI and verify the written content.
- Estimate tempo and global major or minor key from an audio file.
- Turn monophonic audio into a reviewable note sequence.

### Edit and arrange

- Append, replace, quantize, transpose, humanize, duplicate, delete, or clear
  Piano Roll material through the separate FL Studio script workflow.
- Find and prepare patterns FL Studio reports as empty, add section markers,
  organize Playlist tracks, and record supported automation values.

### Bring your own AI

- Claude Desktop and Claude Code
- Codex CLI, IDE extension, and desktop Codex
- Cursor IDE and Cursor CLI
- OpenCode
- Grok Build
- T3 Code through an MCP-capable provider
- Other compatible local `stdio` MCP hosts

## More than a basic FL Studio MCP

To make the distinction concrete, the baseline below is deliberately defined
as a local MCP with transport commands, individual controls, point-in-time
reads, predefined parameter mappings, and note dispatch. It is not a survey of
every other project.

| Capability | Narrow baseline used here | PostFader |
| --- | --- | --- |
| Play, stop, and change in