as a followup to my own post, some simulation with a smaller FFT size and synthetic data (as opposed to records from the sound card) do yield the expected behavior of an FFT analyzer used in cross-correlation mode: jmfriedt.sequanux.org/test_vector.grc generates a cross-correlation peak every N samples, here with N=256. At 10 kHz, that makes for a cross correation peak every 25.6 ms.
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