Audio Reverb Effect Add reverb effects to audio files to simulate room acoustics.

The reverb uses the Web Audio API's ConvolverNode with algorithmically generated impulse responses (IR). The IR is created by filling an AudioBuffer with decaying noise: samples are generated as random values multiplied by an exponential decay envelope (Math.exp(-n / (sampleRate * decayTime))). Different room types vary the decay time, pre-delay, early reflection density, and frequency content of the noise. A ConvolverNode is loaded with the IR and connected in the signal chain. Wet/dry mixing uses parallel GainNodes. The OfflineAudioContext renders the complete audio plus the reverb tail (original duration + decay time). The output is encoded as a WAV file. For higher-quality reverb presets, the IR includes filtered bands to simulate frequency-dependent absorption.