Nyxmix

Name: Nyxmix
Author: Open-Cosmic-Software

by Open-Cosmic-Softwareversion 0.1.0i★ –iRuns on your computer

Registry nameio.github.Open-Cosmic-Software/nyxmix

Install

Overview

Description from the maker (original English)

Agent-first multitrack audio editor: edit sessions live with a human watching.

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: Streamable HTTP
Category: Design, images & audio
You need to fill in: NYXMIX_TOKEN

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: NYXMIX_TOKEN, NYXMIX_DATA

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx 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": {
    "nyxmix": {
      "command": "npx",
      "args": [
        "-y",
        "nyxmix"
      ],
      "env": {
        "NYXMIX_TOKEN": "your-value",
        "NYXMIX_DATA": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add nyxmix --env NYXMIX_TOKEN=your-value --env NYXMIX_DATA=your-value -- npx -y nyxmix

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": {
    "nyxmix": {
      "command": "npx",
      "args": [
        "-y",
        "nyxmix"
      ],
      "env": {
        "NYXMIX_TOKEN": "your-value",
        "NYXMIX_DATA": "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": {
    "nyxmix": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "nyxmix"
      ],
      "env": {
        "NYXMIX_TOKEN": "your-value",
        "NYXMIX_DATA": "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

NYXMIX_TOKEN secret env
Bearer token required for API/MCP access (recommended when reachable by others)
NYXMIX_DATA env
Folder for sessions and audio (default ~/.nyxmix)

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 Open-Cosmic-Software, 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 Design, images & audioi

More stars than 0% of the other 2204 servers in this category
Published to the registry more recently than 61% of the other 2204 servers in this category
Basic checks equal to or better than 100% of the other 2204 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 Nyxmix 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: NYXMIX_TOKEN

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 (0.1.0) reached the registry 20 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Figma Context MCP, Claude Real Video, Figma MCP Server

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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.

NyxMix

The open-source alternative to Adobe Audition, built for people and AI agents together.

Multitrack editing, mixing, restoration, spectral repair, loudness mastering and podcast production in your browser. Free, MIT-licensed, no subscription and no account. Everything you can do in the UI, an agent can do through MCP or REST, and you watch it happen live, see who did what, and can undo any of it.

Checked feature by feature against Audition's official reference: of 65 Audition

features, 50 have an equivalent, 14 go further, 1 is partial, none are missing,

and every row is backed by an automated test (full comparison).

Audio output is verified against EBU R128 / ITU-R BS.1770 (48/48 conformance tests).

npx nyxmix   # then open http://127.0.0.1:3950

Screenshots



Session view. Here an agent cleaned up a rough podcast recording (hum, noise, filler words, pauses), labelled every step in the session log, and left a suggestion for you to accept.	Light theme. Follows your system, or switch it in the top bar.

Spectral editor. Paint out noises, heal spots, draw pitch curves.	Transcript. Edit speech by text, remove filler words in one click.

Start page. Sessions, `.nyxmix` files, and how to connect an agent.	Mixer. Faders, meters, inserts, master spectrum and phase scope.

The demo session was made by an agent with examples/agent-demo.mjs, using nothing but MCP.

Run it

npx nyxmix                               # http://127.0.0.1:3950, sessions in ~/.nyxmix

npx nyxmix --token secret # require "Authorization: Bearer secret" (the UI asks once) npx nyxmix --port 4000 --data ./sessions

Requirements: Node 22+ and ffmpeg 6+ on your PATH (with rubberband, libmp3lame, libopus, which the usual ffmpeg builds have).

From a checkout:

npm install

npm start # same server, data in ./data npm test # integration tests (they boot their own servers) node examples/agent-demo.mjs # an agent producing a podcast episode over MCP

Optional extras

Everything below is optional; NyxMix works without it and tells you clearly when a feature needs one. Python features use a .venv next to the package if there is one, otherwise python3 on your PATH.

For	Install
Pitch correction, pitch curve, remix, restoration extras	Python 3 + `pip install numpy scipy pyworld librosa`
Transcription / text-based editing	Python 3 + `pip install faster-whisper` (model via `NYXMIX_WHISPER_MODEL`, default `small`)
Text-to-speech (generate)	Piper voices in `NYXMIX_PIPER_VOICES` (default `/opt/piper-voices`)
VST3 effects	Python 3 + `pip install pedalboard`, plugins in `~/.vst3` or `VST3_PATH`
LV2 effects	`lv2apply`/lilv and plugins in `LV2_PATH`

Settings

Variable	Default	Meaning
`PORT` / `HOST`	`3950` / `127.0.0.1`	Listen address. Keep `127.0.0.1` unless you put a proxy with TLS in front.
`NYXMIX_TOKEN`	–	Bearer token for API, MCP and WebSocket. Set it whenever anyone else can reach the server.
`NYXMIX_DATA`	`./data` (`~/.nyxmix` with `npx`)	Sessions, audio, renders
`PUBLIC_URL`	request host	Base for absolute URLs handed to agents
`NYXMIX_PLUGINS`	off	`1` allows installing custom plugins (JS/Faust). Plugin code runs on your server, so only enable it if you trust everyone with access.
`NYXMIX_ALLOW_PRIVATE_URLS`	off	`1` lets URL import fetch private addresses (off by default: SSRF guard)
`NYXMIX_RENDER_THREADS`	CPUs − 1 (max 8)	Parallel render processes

The older KLANG_* names still work.

Sessions as files (.nyxmix)

Save .nyxmix (top bar) downloads a whole session as one file: lossless audio, arrangement, effects, automation, markers, versions, undo history, transcripts, noise prints, reference video and the custom plugins it uses. Open a .nyxmix archive on the start page restores it on any NyxMix server; plugins it brings along are installed after the same checks as a normal install (only where plugins are enabled, never overwriting a different plugin with the same id).

Connect an agent

MCP (Streamable HTTP): claude mcp add --transport http nyxmix http://127.0.0.1:3950/mcp (with a token: --header "Authorization: Bearer secret")
REST: /openapi.json, plain-language guide at /llms.txt
Live events: ws://…/ws?project=
Send X-Actor: agent: ; the UI labels edits with it.
Agent skill: SKILL.md

How it is built

One audio graph, two runtimes. public/js/engine/graph.js builds the mix in the browser's AudioContext for playback and in the server's OfflineAudioContext (node-web-audio-api) for export and analysis. Custom DSP (limiter, gate, de-esser, saturation, BS.1770 loudness meter) lives in engine/dsp-worklet.js and runs as an AudioWorklet in both. What you hear is what you export.
Every edit is an operation (server/ops.js): JSON-schema validated, applied atomically in batches (later ops can reference earlier results with "$0.trackId"), undoable, logged with its author, broadcast over WebSocket. The UI uses exactly the same calls as agents.
Lossless storage. Imports become 32-bit float WAV at the session rate. The browser gets a 24-bit FLAC copy (same sound, ~10× smaller). Rendering and destructive processing run on the server in float.
Feature modules in server/features/*.js register their own REST routes and MCP tools: auto-ducking, proposals and versions, transcription and text-based editing, spectral editing and noise-print reduction.

What it does

Editing — multitrack timeline; move, trim, split, ripple-delete ranges, insert silence, copy/paste, duplicate; snapping; automatic crossfades on overlap; fade curves (linear, equal power, S-curve, exponential); clip gain; markers and range markers; sample-level zoom; undo/redo; named versions.

Mixing — per-track effect chains (parametric EQ with draggable bands, compressor, limiter, gate, de-esser, saturation, echo, reverb, gain) and presets; buses with output routing and pre/post-fader sends; volume and pan automation; auto-ducking under speech; mixer view; live peak/RMS meters and an EBU R128 loudness meter.

Restoration — neural voice denoise (RNNoise), FFT noise reduction, noise-print reduction, hum removal, de-click, de-ess, gate, speech leveler, loudness match and normalize, silence shortening, tempo and pitch (Rubber Band); spectral editor with box selection, attenuate and heal; any process can run on a selected range only, with an A/B preview before applying.

Speech — local transcription with word timestamps; delete words to cut audio; language-aware filler word removal; pause tightening.

Analysis — integrated loudness, loudness range, true peak, sample peak, RMS, clipping, DC, spectral balance, silences, RMS envelope, waveform and spectrogram images (agents can look at them).

Export — WAV/FLAC (16/24/32-bit), MP3, AAC, Opus; loudness normalisation to a target; markers as chapters; stems per track; bounce to a new file.

Agents — MCP server with ~70 tools, REST + OpenAPI, live sync, author on every edit, proposals the person previews and accepts or rejects, versions to return to.

Since the first version — effect-parameter automation and clip volume envelopes; 16 more real-time effects (31 in all: multiband compressor, graphic EQ, multimode and auto filters, expander, transient shaper, distortion, bit crusher, ping-pong delay, pitch shifter, doubler, vocal enhancer, exciter, ring modulator, polarity/DC); true-peak limiter; plugins (AudioWorklet modules, test-rendered before install, off unless NYXMIX_PLUGINS=1); 5.1 surround with a surround panner and 6-channel export; video track with synced picture, filmstrip, frame grabs and scene-change detection; spectral lasso, brush, spot heal and pitch display; automatic pitch correction (WORLD vocoder); de-clipper; clip stretch to an exact length; punch-in recording with monitoring and measured latency compensation; delivery checks (podcast, EBU R128, ATSC, streaming, ACX); export tags, chapters, stems and one file per range marker; session archives; music remix to a target length (beat-matched jumps, editable as clips); manual pitch curves drawn on the spectral pitch display; Generate menu (speech from text, tones, noise, silence); undo history you can jump through; remappable shortcuts; goniometer and phase correlation; user presets; live spectrum analyzer; touch editing; parallel rendering on all cores in crash-isolated processes.

NyxMix vs. Adobe Audition

	NyxMix	Adobe Audition
Price	Free, open source (MIT)	Subscription
Runs on	Any modern browser; the server needs Node 22 + ffmpeg (tested on Linux)	Windows, macOS
Multitrack, effects, automation, buses	✅	✅
Spectral editor, noise reduction, de-click, de-hum	✅	✅
Loudness (EBU R128, true peak), match loudness	✅	✅
Transcript-based editing, filler-word removal	✅	–
AI agents edit live (MCP + REST), every edit labelled	✅	–
Review agent changes before they land	✅	–
Several people/agents in one session at once	✅	–
Whole session as one portable file	✅ `.nyxmix`	–
Native plugins live on tracks (VST/AU)	≈ VST3/LV2 on the server	✅
Lowest monitoring latency (ASIO/Core Audio)	≈ browser, with measured compensation	✅

Output quality is measured against EBU Tech 3341/3342, ITU-R BS.1770-4 true peak and bit-exact null tests in docs/conformance.md (48/48 pass).

The full, test-backed checklist against every effect and feature in Audition's official reference is in docs/audition-comparison.md. Summary:

Where NyxMix goes further: an open API and MCP so agents can edit; live shared sessions with authorship; proposals to review agent changes before they land; transcript-based editing and filler removal; chapter export; it runs in a browser with nothing installed.

Where Audition is still ahead: it loads Windows/macOS VST and AU binaries and runs them live on tracks — no browser can load native plugins; NyxMix hosts 275 native plugins — 110 VST3 and 165 LV2 (LSP, ZAM, Dragonfly, DISTRHO, Calf, x42, MDA) on the server with A/B preview, plus AudioWorklet and Faust plugins (POST /api/plugins/faust compiles Faus

Only the beginning is shown; read the rest in the repo

Nyxmix

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 Design, images & audioi

Common questions

Alternatives

Figma Context MCP

Claude Real Video

Figma MCP Server

README from the maker

NyxMix

Screenshots

Run it

Optional extras

Settings

Sessions as files (.nyxmix)

Connect an agent

How it is built

What it does

NyxMix vs. Adobe Audition