Quiet conference recordings, distance microphone interviews, lecture captures, and mobile voice memos are frequently difficult to hear even with computer or phone speakers set to maximum output. This browser-based volume booster applies digital gain amplification to boost audio loudness up to 400% (4x original amplitude) without uploading files to remote audio servers.

### In-Browser Audio Gain Mechanics

The amplifier processes audio streams directly in your browser session via the Web Audio API: - **Audio Decoding:** Reads MP3, WAV, M4A, or AAC audio files into uncompressed 32-bit floating-point audio sample buffers using `AudioContext.decodeAudioData()`. - **Digital Gain Scaling:** Passes multi-channel audio through a high-precision `GainNode` to multiply sample values proportionally from 1.0x (100% unity gain) up to 4.0x (400% maximum boost). - **Peak Limiting Protection:** Employs soft-knee dynamic curve limiting to minimize harsh clipping distortion on transient peaks while elevating quiet spoken passages. - **Uncompressed WAV Export:** Synthesizes the boosted audio buffer into a standard 16-bit linear PCM WAV file with clean 44.1kHz headers for universal playback across all devices.

### Worked Amplification Example

Boosting a quiet smartphone voice memo: - **Source Audio File:** `meeting_recording.m4a` (recorded across a conference room at low gain) - **Selected Boost Factor:** **250% (+8.0 dB Gain)** - **Processing Time:** Instantaneous in-memory audio buffer multiplication. - **Exported Output:** `meeting_recording_boosted.wav` - The resulting audio file plays with clear, audible vocal presence across laptop speakers and earphones without needing external amplifier hardware.

### Processing Privacy Guarantee

All audio decoding, gain scaling, waveform rendering, and WAV file compilation execute 100% locally on your computer. Private voice recordings, client interviews, and confidential meeting audio are never transmitted across the internet.