A comprehensive web application that acts as a microphone amplifier using the Web Audio API with full device selection capabilities.

• Real-time microphone amplification - Captures audio from your microphone and amplifies it through your speakers
• Device selection - Choose specific input (microphone) and output (speakers/headphones) devices
• Adjustable gain control - Volume slider to control amplification level (0.1x to 5.0x)
• Visual audio level indicator - Real-time display of audio input levels with color coding
• Audio output testing - Test button to verify your speakers are working
• Device refresh - Reload available audio devices without refreshing the page
• Feedback protection warnings - Built-in warnings to help prevent audio feedback loops
• Clean, responsive UI - Dark theme with intuitive controls
• Debug information - Real-time display of audio context state and sample rate

1. Load devices - The app automatically loads available microphones and speakers on startup
2. Test audio output - Click "🔊 Test Audio Output" to verify your speakers work
3. Select devices - Choose your preferred microphone and speakers from the dropdown menus
4. Click "Start Amp" - The browser will request microphone permissions
5. Grant microphone access - Allow the app to use your selected microphone
6. Adjust amplification - Use the slider to control the volume boost
7. Monitor levels - Watch the audio level indicator to avoid clipping
8. Click "Stop Amp" - Stops the amplifier and releases the microphone

• Lists all available microphone inputs
• Shows device names when permissions are granted
• Fallback to "Default Microphone" if no specific device is selected

• Lists all available audio output devices
• Note: Output device selection support varies by browser
• Chrome and Edge have better support than Firefox/Safari

• Click "🔄 Refresh Devices" to reload the device list
• Useful when plugging/unplugging audio devices
• Automatically requests microphone permissions to get device labels

⚠️ Feedback Warning: This app can create audio feedback loops if your microphone picks up sound from your speakers. To prevent this:

• Use headphones instead of speakers when possible
• Start with low amplification levels
• Keep your microphone away from speakers
• Be prepared to quickly stop the amp if feedback occurs

• Uses the Web Audio API for real-time audio processing
• Uses MediaDevices.enumerateDevices() for device discovery
• Disables echo cancellation, noise suppression, and auto-gain control for pure amplification
• Includes real-time frequency analysis for the visual level indicator
• Attempts to use setSinkId() for output device selection (Chrome/Edge support)
• Responsive design works on desktop and mobile devices

Works in modern browsers that support:

• Web Audio API
• getUserMedia API
• MediaDevices.enumerateDevices API
• ES6+ JavaScript features

• Chrome/Edge: Full input and output device selection
• Firefox: Input device selection, limited output selection
• Safari: Input device selection, no output selection
• Mobile browsers: Limited device selection capabilities

• Visual feedback to monitor audio levels
• Easy stop button to quickly disable amplification
• Warning messages about potential feedback issues
• Automatic cleanup when the page is closed or refreshed
• Error handling for device access issues
• Graceful fallback when device selection is not supported