Audio Merger Merge and concatenate multiple audio files into a single file.

The tool decodes each uploaded file using AudioContext.decodeAudioData() to produce PCM AudioBuffers. All buffers are normalized to the same sample rate (using the highest rate among the inputs) and channel count (using the maximum channel count). A new AudioBuffer is created with a total length equal to the sum of all input durations. Each input's sample data is copied sequentially into the output buffer using copyToChannel operations. For files with different sample rates, the OfflineAudioContext handles resampling automatically when re-rendering the audio. The merged output is encoded as a 16-bit PCM WAV file. Memory management is handled carefully for large merges by processing in chunks.