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• September 15, 2026Ninety-four splices a secondThe app builds a new AVAudioConverter for every 512-frame mic buffer and never flushes it: 165 frames out of 170.7 survive, 94 times a second. A 1 kHz tone comes out 30 dB dirtier. One converter per capture fixes it; the loud room and the 30 percent mic gain are real but separate.