SlowedLab

An advanced real-time audio player supporting all effects (slow, reverb) that elevate your music/audio playing to next level

Features

• 🎚️ Time-stretching with pitch preservation
• 🌊 Professional reverb engine
• 🎵 Real-time audio effects (EQ, compression, distortion)
• 📊 Waveform visualization
• 💾 Preset management
• 💝 100% Free with optional support

Quick Start with Docker (Recommended)

Prerequisites

• Docker and Docker Compose installed

Run the Application

# Clone or navigate to the project directory
cd slowedreverb_own

# Start both frontend and backend services
docker compose up

# Or rebuild if you made changes
docker compose up --build

The application will be available at:

• Frontend: http://localhost:4000
• Backend API: http://localhost:4001

Stop the Application

docker compose down

Manual Setup (Development)

Prerequisites

• Node.js 18+ and npm installed

Backend

cd backend
npm install
npm run dev

This starts the Express server on http://localhost:4001

Frontend (in a new terminal)

cd frontend
npm install
npm start

This starts the React dev server on http://localhost:4000

Usage

1. Open the app at http://localhost:4000
2. Upload an audio file using the upload area (supports MP3, WAV, FLAC, OGG, AAC, and more)
3. Apply effects:
   • ⚡ Time Stretch: Adjust playback speed while preserving pitch
   • ✨ Reverb: Add spatial depth and ambient effects
   • EQ: Shape frequency response (bass, treble)
   • Compressor: Control dynamic range
   • Distortion: Add grit and aggression
4. Preview in real-time with the interactive waveform viewer
5. Manage presets using built-in effect presets or create custom ones
6. Export your processed audio as a WAV file
7. Report bugs using the 🐞 button for feedback and improvements

Tech Stack

• Frontend: React 18, TypeScript, Web Audio API, Vite
• Backend: Node.js, Express, TypeScript
• Audio Processing: Web Audio API (100% client-side)
• Containerization: Docker & Docker Compose
• Styling: CSS3 with modern gradients and animations

Specifications

• File Support: MP3, WAV, FLAC, OGG, AAC, and more
• File Size Limit: 200MB per file
• Processing: 100% client-side (your files never leave your browser)
• Storage: Browser caching via IndexedDB for faster reloads
• Error Handling: Comprehensive validation and user-friendly error messages
• Real-time Performance: Sub-50ms effect processing
• UI Responsiveness: Touch-friendly waveform interactions

Legal

• Terms of Service
• MIT License

Support

This project is 100% free. If you find it useful, consider supporting on Ko-fi ☕

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Made with ❤️ for audio enthusiasts | SlowedLab - Elevate Your Audio Experience