Reproduced independently: X = (cumulative start of the .pNN segment) mod 2048. The running sums of the five sound.pNN file sizes are 0, 1392, 1468, 1600, 1728 -- exactly the four values measured, plus zero. The XMA grid is 2048-aligned inside each segment file, the segments are not multiples of 2048 long, so each join shifts the phase. Two of my explanations on this page were wrong even though the measurements stand. 'Varies by language and subdirectory' was correlation, not cause -- directories cluster into segments. And there is no header at all: those bytes are the PREVIOUS bank's audio, which is why they had no length field and looked like data. Also records a disagreement I could not resolve. auto/slb-loader withdraws my '69.8% over-declare' finding as declared-sizes-are-exact, but VOICE_TCAF_608 declares 759808 bytes of data with 55296 bytes to the next TOC entry. Both readings agree the declared size exceeds the window; mine said 'truncated', which I withdraw as an over-claim, but 'exact' requires a wave to span ~14 named entries. Recorded with the experiment that would decide it.