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P4: NOTES — full honest corpus assessment (dual/al/res/t1k/t1kq baseline mean 0.77, max 2.12)

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Systematics isolated: Pchip LUT frozen cap under-predicts loud tail (t1k_b1f needs
LUT 0.70 at xv 0.85), over-predicts low tail (al lv24 needs 0.35 at xv -0.5).
Real LUT extracted from refs; parametric fit A=-13.78/B=68.29/g=0.344 regresses dual
(rejects in full render). Structural next: decode BandConfig ctx+0x188 writers.
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2026-08-20 18:25:02 +03:00
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@@ -952,3 +952,21 @@ VALIDATION (scale sweep):
## ============ UPDATE 2026-08-20q: METRIC FIX + LOG-DOMAIN LUT PORTED (honest baseline) ============
### CRITICAL METRIC BUG FOUND: 24-bit refs mis-decoded as 16-bit
Earlier dual
## ============ UPDATE 2026-08-20r: FULL-CORPUS HONEST ASSESSMENT (committed baseline) ============
Honest 24-bit metric across ALL datasets (input=3.5s window, correct sw decoding):
dual (band fc=500, q-sweep 11): mean|err| 0.41-0.61, max 0.72 ✓
al_* (fc=1000==tone, level sweep): lv3-12 err 0.05-0.43; lv18 -1.12, lv24 -1.80 (LOW-level over-cut)
res_only1 (resonant.wav, fc 300..700): -1.71..+0.81 (under-cut off-center, shape)
t1k_b1f (tone1k 0dBFS loud, fc sweep): +1.6..+2.12 (LOUD under-cut: LUT cap 0.667 too low)
t1kq_only1 (tone1kq, fc 800..1200): -0.59..+0.01 ✓
OVERALL mean|err|=0.77, max 2.12.
Systematics: Pchip LUT frozen (floor 0.366/cap 0.667 from al_* mid-level) under-predicts
BOTH the loud tail (t1k_b1f xv>0.8 needs LUT~0.70) and over-predicts low tail (al lv24
xv<-0.4 needs LUT~0.35). Real LUT extracted from refs: 0.351@-0.5, 0.60@0.07, 0.70@0.85.
Parametric FUN_180563a60 fit to extracted points: A=-13.78dB B=68.29dB gamma=0.344
(mean|err| 0.017 over extraction pts) but full-render VALIDATION regressed dual (real
multiband interplay absent) -> keep Pchip baseline committed; A/B/gamma = runtime
BandConfig ctx+0x188, NOT live-captured (SET TO: static path uses preset curve).
Structural next: decode BandConfig ctx+0x188 writers (FUN_1804835d0/487200 at
decomp_funs2.txt:21937/21962), wire combine 0x5407c8 + FFT-conv 0x535a70.