SE cue waves located inside Static.slb by playing them.

Method: run Canary with --xma_param_probe=true, drive the main menu, and read the
per-stream XMA-PARAM lines. Each line carries the stream's first 32 bytes; those
bytes are then searched for in Static.slb's 8 353 472 readable bytes.

event                     packets  bytes   channels/rate   offset in Static.slb
------------------------- -------  ------  --------------  --------------------
d-pad move (cursor)             4    8192  mono 48000 Hz   0x1ec0
B / back (cancel)               2    4096  mono 48000 Hz   0x0ec0
A / confirm (title->menu)       6   12288  mono 48000 Hz   0x5d6c0

Each head matched at exactly ONE offset. The first two are contiguous:
0x0ec0 + 4096 = 0x1ec0.

Simultaneously at the main menu, two STEREO 48 kHz streams were decoding:
1893 packets / 3 876 864 B and 1919 packets / 3 930 112 B. See
structures/bgm-two-stems.md -- this is the runtime observation that the two
stems of a music bank play at the same time.

DECODED 2026-08-28 with tools/re-capture/slb_extract_wave.py + ffmpeg's xma1:

  event            offset    packets  decoded    rms    peak   envelope shape
  ---------------- --------  -------  ---------  -----  -----  ------------------------
  d-pad move       0x1ec0          4   0.533 s   2085  29813  sharp attack, monotonic decay
  B / back         0x0ec0          2   0.344 s   2985  16973  attack, peak in frame 2
  (pre-input cue)  0x5d6c0         6   1.016 s   4327  32767  peaks in frame 3, long decay

CONTROL: the same synthesized RIFF wrapper applied to BGM_001.slb's first wave
(offset 14336, stereo) decodes to 173.808875 s -- identical to the duration
obtained from that bank's own on-disc RIFF header. The wrapper is correct.

SECOND RUN 2026-08-28 -- independent boot, same probe:
  * d-pad move and B reproduced with IDENTICAL head bytes and sizes (2 of 2 runs).
  * The 12288-byte wave fires on the A that advances title -> main menu, together
    with the two stereo BGM stems (the menu's music starting). Counting from the
    title rather than the menu is what attributed it.
  * Left and Right fired NO new stream -- no distinct invalid cue. (Dedup caveat:
    a press replaying an already-heard wave would also log nothing.)