P4: Phase B — framed_model re-transcribed to the confirmed chain (NOTES:199-226)

Fixes structural divergences: IIR1 into shared 0x5406f8 buffer + bridge to band
mask (FUN_18052d650, 0x5160); IIR2 on band mask; Hermitian mirror (0x11940);
blend step f6f8=axis(1-mix)+mix*0.8, mask=exp2(-mask)*f6f8; real combine via
kRTAtt/kRTRel weights (0x5406c8/6e8); warp, IIR3x2, dry/wet.

Validation: t1kq only1 fc1000 -21.1 vs -22.1 (OK); fc-scan shape intact;
dual @500 matches (s30 -51.5 vs -53.7), @2000 gap -4..-13 vs -29.6 remains.
That gap = dB-domain band LUT (FUN_180563a60) not yet in chain -> Phase A.

handoff/NOTES_LEVEL.md

@@ -923,3 +923,28 @@ swept 800..1200, refs t1kq_only1_<fc> = true single-band) tracks the reference s
 Remaining under-cut off-center: real soothe reduces ~16-22 dB broadly across
 800-1200 while model narrows; candidate = FFT-conv smoothing + warp + q shape.
 DEFAULT level_scale for am/res path ~= 35-45 (was 600 for the wrong am*res path).
+
+## ============ UPDATE 2026-08-20p: Phase B — framed_model RE-TRANSCRIBED ============
+Re-transcribed dsp/framed_model.cpp per confirmed chain (NOTES:199-226, source
+/tmp/consumers_out.txt:638-1111). Structural divergences from the old approximation:
+- IIR1 (FUN_18052d650, state 0x440518) writes into the SHARED 0x5406f8 buffer,
+  then bridges into the band's 0x540678 (:731 0x5160); IIR2 (0x3404f8/0x2c04f8 on
+  the band mask) kept separate.
+- mirror 0x11940: upper half = reversed lower (Hermitian), full-nfft scratch.
+- blend step: f6f8 = 0x540698·(1−mix) + mix·0.8; mask = exp2(−mask)·f6f8. C_AXIS=1.3
+  placeholder (offline 0x540698 = per-band scalar, NOT the exp-formula; NOTES:354).
+- combine (0x8d60/0x3c40/0x5a20): track = (mask−blend) + kRTAtt·blend +
+  kRTRel·blend + mask, using live weight tables kRTAtt/kRTRel (0x5406c8/6e8).
+- warp (0x540768·0x5406a8), IIR3 (A3/B3)x2, dry/wet identity.
+
+VALIDATION (scale sweep):
+- DUAL (band fc=500, tones 500+2000 at −7.23 dBFS): ref @500 −53.7/@2000 −29.6.
+  model @500 matches over scale (s30 −51.5, s42 −58.1); @2000 stuck ~−4..−13 (way
+  short). The DAZING far-field reduction (reduce 2000 by −29.6 when band is at 500)
+  does NOT come from the exp2(−linear·level) chain — exp2(am/res) collapses to ~0
+  once res@2000 (1.344) ≫ res@500 (0.1175).
+- T1KQ only1 fc1000: −21.1 vs ref −22.1 (OK). fc-scan shape intact.
+=> Phase B confirms structurally: the missing stage for dual-far-field is the
+   dB-domain LUT FIX_180563a60 (level_dB = 20·log10(mask) → t=(dB−A)/(B−A) clamp →
+   t^γ), which COMPRESSES the exp2 collapse into a smooth log curve. NEXT = decode
+   BandConfig ctx+0x188 writers (A/B/gamma) + 0x540698 -> then wire into the chain.