diff --git a/song-274/BOM.md b/song-274/BOM.md
index 31210d7..d455598 100644
--- a/song-274/BOM.md
+++ b/song-274/BOM.md
@@ -1,12 +1,13 @@
 # Bill of materials — 274
 
-4 file(s), 238.8 MiB. Generated by `scripts/bom_gen.py`.
+5 file(s), 465.6 MiB. Generated by `scripts/bom_gen.py`.
 
 ## audio
 
 file                      size       hash                        description
-------------------------  ---------  --------------------------  -------------------------------------------------------------------------------------------------------------------------------------------------------------
-`audio/274_release1.wav`  226.8 MiB  `4287774b506177d282b8a035`  Release master of "274" (updated 2026-09-16, replaces 274_release.wav) — stereo, 48 kHz, 32-bit float PCM, 10:19 (619.27 s). Peak -0.4 dBFS, mean -12.4 dBFS.
+------------------------  ---------  --------------------------  ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
+`audio/274_release1.wav`  226.8 MiB  `4287774b506177d282b8a035`  Release master of "274" (2026-09-16), superseded by 274_release2.wav — stereo, 48 kHz, 32-bit float PCM, 10:19 (619.27 s). Peak -0.4 dBFS, mean -12.4 dBFS.
+`audio/274_release2.wav`  226.8 MiB  `834aad4988f387dd9871d099`  Release master of "274" (updated 2026-09-17, replaces 274_release1.wav; used by the white/lyrics renders and Song274Transect) — stereo, 48 kHz, 32-bit float PCM, 10:19 (619.27 s). Float peak +0.25 dBFS (1.0297; 25 samples beyond full scale), mean -13.1 dBFS.
 
 ## images