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============ 2026-08-18 (LEVEL-PATH STRUCTURE DECODED) ============

Две twin-цепочки (аудио vs маска-таблица)

(a) FUN_180536300 (float, N=0x200=512, per-channel AUDIO): вызван FUN_18058e380: FUN_180536300(state+0x18, in+0x8e0+ch0x800, in+0xe0, band, 0x200). lVar1=scratch+N32; normalize lVar1[i]=in[i]2pi/(ossr) (0x18052da00=pointwise scale); per band: FUN_180536f90(lVar2, base, band_i, lVar1, N) -> copy lVar2->base(0x1800096c0); base*=product (0x180008700); if band_active: save->lVar4, product=1.0; out=copy lVar4->param_2. => out = PROD_active_bands mask_band(норм. аудио). На |x|<1 z=ротор(1e-5)=i -> маска ~пост. (b) FUN_18056e3e0 (double, N=0x400=1024): вызван FUN_180563440 (6 band-слотов). Аналогично. Вход param_3 в контексте FUN_180563440 = LUT-рампа [0,1] (param_1+0x198, шаг 1/1023), shape через кривую param_1+0x188 => это УРОВНЕВАЯ LUT-маска, не аудио.

FUN_180563440 (per-block маска-таблица, 6 полос)

  • param_1+0x198[i] = i*(1/1023), затем маппинг кривой param_1+0x188: pfVar10[0]=min, [1]=max, [3]=gamma-кривая, [4]=флаг linear, [+0x14]=nodes. linear: val = min+(max-min)*exp(log(x)/c) = min+(max-min)*x^(1/c) (gamma).
  • 6x FUN_18056e3e0 -> 6 полосных масок (param_1+0x4198+0x2000k); комбайн -> param_1+0x2198; затем LUT (param_1+0x98): пары (x=i*fVar3, y=mask) на 0x3ff точек (уровень->маска).
  • вызывается FUN_1805631c0 (vtable 0x1824b14f0) + FUN_180563ce0/563fa0 (следующие шаги).

FUN_180563ce0 — per-bin IIR level-трекеры (342 бина, 2nd-order state pairs)

  • Константы 0x1824c4780/4788/4790/4798 (double A/B), 0x40400000=3.0f (порядок).
  • Буферы: param_1+0x28 (float order), +0x40/+0x58 (double state A/B), stride 0x60, 0x156 итераций. => на каждый бин ставится 2nd-order IIR (атака/релиз) для сглаживания уровня.

FUN_180530b60 — параметры сглаживания (log-interp + exp)

  • cac=exp, cd0=log. freq-диапазон: online 800..1200 Гц (DAT_1824c4594=800/45a8=1200), offline 15..180 Гц (4418=15, 4518=180), gain 0.01..1.0 (3c70=0.01, 3ea4=1.0).
  • FUN_180533340(+0x2404e8/0x340500/0x440518, ...) — инициализация smoothing-фильтров (3 экземпляра: 3 канала/oversample?).

FUN_180530d30 — per-bin СПЕКТРАЛЬНЫЕ ВЕСА (0x5406b8/0x5406c8/0x5406d8/0x5406e8)

  • fVar9 = cdc(2000/(sr*0.5)*513/(i+1)) = cdc(2000/f_bin) — pow? (IAT-стаб 0x181b3b378).
  • fVar11 = [param_1+0x540880]0.25fVar9*fVar13 (0x540880/884 = per-band уровень/сенс).
  • buf[i] = cd6(0.1, 1.0/(exp(1/(1+x))*dVar1)); buf_c[i]=1-buf[i]. cd6 = log10? (0x1824c3f70=0.1).
  • dVar1 = (sr/[param_1+0x1a0])*[param_1+0x1ac]*0.001.
  • => частотно-зависимый вес: 2000 Гц (f_bin больший) -> fVar9 другой, чем 500 Гц. Кандидат объяснения red2000>red500 (dual_b1q): вес нормирует уровень бина выше на высоких частотах -> избыток уровня больше -> глубже крас. ПОТРЕБУЕТ ВЕРИФИКАЦИЮ.

IAT-хелперы (0x181a14xxx — jmp [GOT 0x181b3b3xx], цели 0x6fffff, динамич. загрузка)

  • Последовательность стабов каждые ~6-12 байт => стандартные CRT math (в порядке импорта).
  • Семантика по алгебре: cac=exp, cd0=log (log-interp в 530b60), cdc=pow (2-арг, pow(x,0.7/2.0)), cd6=log10? (cd6(0.1, y)=log10(y)/log10(0.1) в 530d30), cd6 может быть log2.
  • cf4/ce2/c9a/cc4/cfa — для case1/case8 генераторов (cfa в FUN_1805343e0: w=1/cfa(fc*pi/fs) => cfa=sin, cf4-цепочка для q-клипинга).

КЛЮЧЕВОЙ ВЫВОД

  • Частотная СЕЛЕКТИВНОСТЬ маски = freq-path нотч |2B/A| (m2c, центр=fc) на оси бинов (t1kq fc-скан rmse=0.007).
  • ГЛУБИНА/уровневая зависимость = level-path LUT (уровень->маска, кривая +0x188) + per-bin IIR-трекеры уровня (0x563ce0) + спектр. веса (0x530d30, 2000/f_bin).
  • dual_b1q (red2000>red500 при q<1) требует совместной модели levelвесанотч — единственный способ получить больше cut на 2000 чем на 500 при band=500.

============ UPDATE: CONSUMER OF PER-BIN WEIGHTS FOUND (FUN_180529fe0) ============

FUN_180529fe0 — per-block СПЕКТРАЛЬНЫЙ ПРИМЕНИТЕЛЬ (5 каналов, ключевой DSP-цикл)

Сигнатура (param_1=DSP-объект, param_2, param_3, param_4=nBands). Для каждой полосы:

  1. 0x540678[band] *= (fVar30/sr) * 0x540870 (нормализация уровня × sens 0x540870)
  2. IIR-сглаживание спектра (5 каналов, состояния 0x540528/2c04f8/3404f8/4c0528/440510, через DBL-петли: y += xa + yb, backward/forward проходы) => level-трекер per-bin
  3. 0x5406f8 = резонансная реакция полосы (копия 0x540678[band], каскад 0x540688-коэфф, scale fVar30/nBands) [здесь twin-результат 0x5406f8]
  4. 0x5406f8 *= 0x540698 (частотная ось, log-интерп) и *= 0x5406a8 (axis)
  5. *** ПРИМЕНЕНИЕ per-bin ВЕСОВ: *** thunk_180003c40(lVar21=0x5406f8+N, 0x5406c8, 0x5407c8[band], iVar19, 4) -> 0x5407c8 += 0x5406c8contrib thunk_180003c40(lVar17=0x5406f8, 0x5406e8, 0x5407c8[band], iVar19) -> 0x5407c8 += 0x5406e8contrib (0x5406c8=1-0x5406b8, 0x5406e8=1-0x5406d8 — КОМПЛЕМЕНТАРНЫЕ веса)
  6. накопление: thunk_180005a20(0x5407c8[band], 0x540678[band], iVar19)
  7. dry/wet: 0x1c[band]scale (0x5408b8==0: +0x5406780x1c[band]*...)
  8. FFT-свёртка в time-domain: FUN_180535a70(0x540628, 0x540678[band], nBins+1) -> frame; FFT-таблицы 0x540548/550/598; 0x540668 -> out-буфер (0x3f800000=1.0 в DC-бин).

FUN_180530d30 — точная формула per-bin весов (0x5406b8/6c8/6d8/6e8)

iVar6 = NFFT/2+1; fVar12 = 2000/(0x240.5) [p24=40000 -> fVar12=0.1] fVar13 = 4.0 (или 1.0 если 0x5408b8); dVar1 = (0x24/sr)0x1ac0.001 [секунды] for i in bins: fVar9 = cdc( (fVar12iVar6)/(i+1) ) = exp?/pow? (0.1513=51.3 / (i+1)) fVar11 = 0x540880 * 0.25 * fVar9 * fVar13 dVar10 = 1/(1 + fVar11/(0x5408804)) = 1/(1+fVar11/(4level)) dVar10 = exp(dVar10 * fVar11) dVar10 = cd6(0.1, 1.0/(dVar10dVar1)) = log10(1/(dVar10*dVar1))/log10(0.1) buf0x5406b8[i] = dVar10; buf0x5406c8[i] = 1-dVar10 (аналогично 0x540884 -> 0x5406d8/6e8) Численно (p24=40000, sr=48000, 0x540880=1, 0x5408b8=0): bin500: fVar9=exp(4.4)=81 -> w=2.49 ; комплемент 1-w=-1.49 bin2000: fVar9=exp(1.17)=3.2 -> w=1.60 ; комплемент = -0.60 => частотно-зависимые (сильно убывающие с частотой) веса. НО q входит через 0x540880/884 (устанавливается из полосы) и через 0x5406f8-резонанс.

BUFFERS (map окончательный)

0x540698 freq-ось (log-интерп, множится в band-ответ) 0x5406a8 axis-буфер (множится в band-ответ) 0x5406b8/6c8, 0x5406d8/6e8 per-bin level-веса (пары w, 1-w) — потребляются в FUN_180529fe0 0x540678[band] per-band спектр/вход (0x10-стрide, 2 слова = {ptr,count}? нет, 0x540678+0x10k) 0x5407c8[band] per-band маска-аккумулятор 0x540748 warp-ось = 8.3 - 7/(1+exp((x20000-120)(-0.01))) ~= 1.3 (DC-буст 6.68), НЕ f/(f+K)! 0x540628 FFT-work, 0x540548/550/598 FFT-таблицы, 0x540668 out, 0x5406f8 band-фильтр/рабочий

FUN_180535ae0 = конструктор DSP-объекта: 0x540874=1.0, 0x54087c=0.5, 0x540884=1.0,

0x54088c=1.0, 0x540894=1.0, 0x24=0x472c4400=40000.0f (!), 0x5408ac=0x01000000.

FUN_180535f10 = деструктор (free всех 0x5406xx-буферов).

ИТОГ: dual_b1q объясняется комбинацией

mask(bin) = |резонанс_полосы|(bin) × freq_axis(bin) × level_weight(bin, 2000/f_bin) где level_weight через exp(51.3/(bin+1)) даёт РАЗНЫЕ веса на 500 и 2000 Гц, и на 2000 Гц маска глубже при низком Q (резонанс шире/мелкие). Верифицировать в standalone-харнессе.

============ UPDATE 2026-08-18: 0x530d30 weights DECODED + NUMERICALLY NEGATIVE ============

  • Exact formula (decomp 22330, FUN_180530d30): per bin base = (2000.0/(sr*0.5))iVar5/(bin+1) [iVar5=NFFT/2+1] w8 = powf(base, 0.25) v = [0x540880]0.25w8fVar12 [fVar12=4.0 if offline flag, else 1.0] q = 1/(1 + v/([0x540880]4)) (second pair 0x540884: q2=1/(1+v2/[0x540884])) dVar1= (sr/[0x1a0])[0x1ac]0.001 w = 0.1^(1/(max(qv,floor)*dVar1)) [0x1824c3f70=0.1, 0x1824c3e30=0.001] buf0x5406b8 = w ; buf0x5406c8 = 1-w (and 0x5406d8/6e8 with 0x540884)
  • Constants locked: c3d3c=0.25, c4334=4.0, c3d8c=0.5, c45b4=2000.0, c41e0=2.0.
  • NUMERIC RESULT: at any plausible runtime (sr=44100, NFFT=1024, L=0.05..1.0, hop 1024..4096, n1ac 1..12) -> w(500)=w(1000)=w(2000) ~= 0 (=10^-20..10^-0.07); complements ~= 1. => the 0x530d30 level-weights DO NOT create the 2000-vs-500 tilt (ratio2000/500 ~1.0).
  • CONCLUSION: dual_b1q red2000>red500 does NOT come from 0x530d30. Suspect = freq-axis warp (0x540698 '8.3-7/(1+exp((x20000-120)(-0.01)))' ~1.3 DC boost) x resonance. The model's empirical tilt {500:1.414,1000:1.454,2000:1.795} stays as the placeholder; replacing it requires FUN_180529fe0 consumer step-5 algebra + runtime level values (Phase-4/5 dive).

============ UPDATE 2026-08-18 (CHECKPOINT): tilt != warp, level-path decoded ============

  • FUN_180563ce0 = INIT of per-bin IIR level trackers (not update): 0x156=342 bins, order=3.0f (0x40400000), coeff A/B mvaps 0x24c4780/4790, strided fill; 3rd pass fills 0x40e00000=7.0f (post-gain). FULL: /tmp/opencode/f_563ce0.dis.
  • Level-path map: 0x563440 (LUT curve +0x188: [min,max,gamma,linear flag,nodes]; 6 bands via 0x56e3e0 double-twin N=1024 with LUT-ramp input; combine -> +0x2198; LUT pairs +0x98 at 0x3ff pts level->mask). NOT in decomp_funs.txt; use /tmp/opencode/f_563440.dis + level_notes.md (LOCAL: /home/m/re-tools/handoff/).
  • DECISIVE NEGATIVE: warp(2000)=0.773 cannot reach dual red2000=15.2dB — C=depth·warp·LUTmax=0.864·0.772·0.667 =0.445 < needed 0.826 (C=1-10^(-15.2/20)). warp is NOT the empirical tilt. The gap is closed by the blend step (0x5407c8 += weights·res_upper/lower, freq-axis 0x540698) + FFT-conv 0x535a70 shaping.
  • CHECKPOINT decision (user): STOP; next session = diagnostic bridge (two-term mask: warp·LUT + α·freq-axis_term, fit vs measured curves) BEFORE transcribing FFT. do NOT curve-fit without the blend term.

============ UPDATE 2026-08-18 v2: BRIDGE DONE + FUN_180529fe0 full algebra ============

  • Полный декомп FUN_180529fe0: /tmp/consumers_out.txt:471-1277 (f529fe0.dis в /tmp обрезан на 52a813). Поправки к прежним заметкам:
    • 0x5408b0 = таблица ГРАНИЦ бинов (прелюдия: cvttss2si+imul+idiv, iVar20=band-start, iVar19=len), НЕ LUT.
    • Уровневая маска резолвится ИНЛАЙН: fVar30=0x5408b0[idx]; fVar25=(float)FUN_181a14cdc()=pow (IAT→GOT 0x181bab378, CRT-цель вне дампа); пары ×(fVar30−fVar25)/+fVar25· (dry/wet уровня).
    • Цепочка per-band (по декомпу): 0x540678=res; res*=∏0x540688[k]; res*=(fVar30/nBands); *=fVar29·0x54088c (fVar29=(fVar30/0x1a0)·0x540870); IIR 0x52d650 state 0x440518; двойное IIR-сглаживание (double, states 0x3404f8/2c04f8 и 0x440510/3c0510); 0x5407c8+=0x5406c8·res_up + 0x5406e8·res_low + 0x540678 (003c40, kernel vfmadd213pd) — АДДИТИВНЫЙ аккумулятор; 0x540678 *= res(008700) и *= warp 0x5406a8; offline: *=0x1c[band]·fVar27 (глубина, D=-0.5@0x24c4670); dry/wet: mask·fVar30·0x540888 + (fVar11−fVar30) (fVar11=1.0 c3ea4) — педастал; FFT-conv 0x535a70 (fwd, window 0x540550/598, kill mirror, inv, ×0x540658, fwd, inv, 0x540668[0]=1.0[1]=0, apply FIR к param_2[band]).
    • Константы offline: c3ea4=1.0, c3e28=0.8, c4670=−0.5, c4674=−0.7, c4680=−1.0, c3c58=0.001.
  • BRIDGE RESULT (model_fir.py, rmse=0.236 dB): C(f)=1.221·LUT(log10(L0/res)) + 0.358·warp(f)^3.143. res(500;fc500)=0.117 Q-независим -> C500-константа без tilt; xv(2000)=0.308..−0.656 (Q) -> C2000-и-гг-форма; аддитивный терм warp^3.14 даёт +0.15 на 2000 и ≤0.02 на 1000 (иначе t1k рушится) — единственная точка, совместимая с 36 замерами. Мультипликативный warp·LUT проваливается (>10 dB). warp^3.14≈π: кратный каскад? Остаток 0.7 dB (Q=0.1) = LUT-колено 0.574 -> нужен FFT-уровень (0x535a70 + окно 0x540658 + freq-axis 0x540698), см. SESSION_HANDOFF §5-6.

============ UPDATE 2026-08-18c: FFT-CONV LOOP FULLY MAPPED (Phase 5 step 3 partial) ============

Per-band FFT-conv loop disasm: /tmp/opencode/f_52b570.dis (0x52b550-0x52b8b5 == consumers :1195-1271).

What 0x535a70 / helpers ARE (they're dispatchers, real kernels in base-CRT):

  • 0x535a70 = FFT fwd dispatcher -> 0x140a10 (scalar) / 0x140a70 (vector). NOT hand-transcribable, unnecessary.
  • 0x540548/0x540550/0x540598 = FFT-PLAN table ptrs (plan 0x540530; +0x18/+0x20/+0x68), NOT windows. Plan built by FUN_18052dc30(param_1+0x540530, [0x64]=FFT size, 0x540868). 0x540534 = plan+0x4 = N/2 usage.
  • Per-band ops (dispatch variants collapsed): iVar20=N/2; r14=FIR(0x540668);
    1. 0x535a70(fftctx 0x540628, mask, N/2+1) forward FFT of mask
    2. 0x2210(0x540628, 0, r14, N/2+1) inv FFT into FIR
    3. fwd FFT (0x2180/0x1bb0) ; zero @[N] ; 0x52d920(r14+4, xmm13, N/2-1)=fill LOW half; 0x52db50(r14+4+N/2, xmm9, N/2-1)=fill HIGH half; inv FFT (0x1a90/0x19d0)
    4. 0x140b30/0x140aa0(r14,r14,N/2+1) in-place complex op
    5. fwd FFT ; zero @[N] ; 0x52d990(r14, 0x540658+N/2, N/2) = FIR *= WINDOW 0x540658; 0x52db50(r14+N/2, xmm9, N/2) = fill HIGH half; inv FFT
    6. FIR[0]=1.0f, FIR[1]=0; if 0x540890!=0: complex ops (0x1880/0x1ca0) + FIR = 0x540888 over 2N; copy FIR->out (0x1df0/0x1f70).

Key unknowns (static analysis exhausted):

  • 0x540658 window content: ONLY 1 direct ref in whole dump (the read at 0x52b771). Not allocated in consumers_out (:119-135 alloc 668/698/6a8/6b8/6c8/6d8/6e8/6f8/708/718/798), NOT set by 52dc30 (plan tables only at +0x18/0x20/0x48/0x58/0x68). Written only indirectly -> needs runtime capture OR plan-internal region. If 0x540658 is freq-shaped, it is the source of warp^3.14 (~π) & LUT-knee 0.574.
  • xmm13/xmm9 fills = config constants from FUN_180529fe0 prologue (offline), unknown values.
  • FFT size N = 20x540534; 0x1a0 = pow(2,floor(log2(SR/44100)))412 (SR 44.1k -> 412); 0x540868=0x1a0iVar98.

Conclusions:

  • freq-axis NOT the boost source (offline const). FFT tables NOT windows. The whole freq-shaping funnels through 0x540658 window in step 5 + the offline fill constants. To resolve: runtime capture of 0x540658 (needs the plugin under a debugger) OR empirically back out its response from the model residual.
  • Recommend: since bridge already at 0.236 and FFT window content is static-invisible, next high-value move = full pipeline render (step 5) rather than more static FFT mining.

============ UPDATE 2026-08-18b: FREQ-AXIS 0x540698 BUILDER (decomp :21735-21757) ============

  • Allocation+fill of freq-axis 0x540698 lives in the SAME function as the 0x540668 FIR window alloc (decomp_funs.txt :21735-21757, the builder calls FUN_18052e190(param_1+0x540698, count=0x54086c)).
  • OFFLINE branch (param_2=='\0'): the whole 0x540698 array is filled with ONE scalar fVar29 = (DAT_18262b5c8 * LUT_BANDBOUNDS[uVar3+1] * DAT_18262b704 * LUT_BANDBOUNDS[uVar3] + fVar22) * DAT_18262b700 (DAT_18262b5c8/DAT_18262b704/DAT_18262b700 = Soothe2ModuleBase statics, uVar3 = 0x5408b0 boundary index). => OFFLINE freq-axis is CONSTANT (per-band-band-width scalar), NOT the '8.3-7/(1+exp...)' formula. The exp-formula suspicion was wrong for offline path. Any per-bin frequency dependence must enter via WARP 0x5406a8 (freqpath.cpp, already transcribed) and the 0x540668 FIR (FFT-conv impulse).
  • 0x540668 (FIR window, count 0x54086c*2) allocated right before; filled with 1.0f (0x3f800000) in offline init at :21798-21804 (<=> flat impulse). So in offline the FFT-conv kernel starts as a pure del a; the real kernel arrives from 0x535a70 processing (to transcribe next).
  • 0x5406a0 = element count used by the fill loop (large, ~0x54086c). Buffer 0x5406b8..0x5406e8 (level-weights caps) allocated at :21753-21757 with the same count.

============ UPDATE 2026-08-18 (Phase 5 step 2): FUN_180529fe0 COMBINE ALGEBRA — FULL CHAIN DECODED ============

Source of truth: FULL decomp in /tmp/consumers_out.txt:471-1277 (the decomp_funs.txt copy at :11425 is TRUNCATED — Ghidra dropped the middle because of the noreturn/dispatch thunks (*DAT_181bab008)(&..,&..) guarding small-vs-vectorized variants; the consumers_out.txt copy came from a previous session's getFunctionContaining(0x52ac64) and has the complete per-band loop + FFT-conv).

Data-type map (from allocation sites, consumers_out :119-265)

  • 0x5406f8 double[], size (0x540868)<<3 — resonance/freq-blend buffer (upper half = mirror)
  • 0x5406a8 float[] size 0x54086c — WARP (the tilt!)
  • 0x5406c8/6e8 float[] size 0x54086c — level-weights' complements (0x530d30 writer)
  • 0x540678[band], 0x540768[band], 0x5407c8[band]: pointer arrays stride 0x10 (re/im or cur/prev)
  • IIR states: 0x440518 (+0x4c0528), 0x3404f8, 0x3c0510/0x440510

Thunk identity table (full decomp pairs; A = small stub, B = vectorized body)

  • 009be0/00ffe0 : buf = scalar·buf (float; 004700-pair: double) BODY: mulss
  • 008700/00fb60 : dst *= src (in-place, float, vmulss) ← WARP APPLY (dst=2nd arg)
  • 011940/010860 : copy/mirror (double, complex stride via 5th arg==4; kernel 0x181a99c40)
  • 006e40/004720 : dst = src·scalar (B double: vmovsd) ← freq-axis blend
  • 015060/014c40 : buf += scalar (B double: vaddsd) ← dry offset
  • 005a20/006840 : acc += src (kernel 0x18001a5a0, double)
  • 003c40/00ee20 : acc += a·b (kernel 0x1800752e0: vfmadd213pd, DOUBLE) ← WEIGHT APPLY
  • 008d60/00dc40 : 3-ptr combine, TBD (mask accumulate)
  • 26b820/3a06a0 : big kernel (sets MXCSR; loads rodata 0x181f31680/34a80 tables) → likely exp/sat s.t. begin? TBD
  • 2dc0e0/367980 : fills dst buffer with constant pattern 1.0/0.0 (vmovdqu rodata) — TBD (dry/wet?)

CONFIRMED per-band pipeline (lines ref 638-1269) for the rendered (online) stage

per band (band in [iVar20, lVar18)):

  1. scale: 0x540678[band] = ((fVar30/0x1a0)·0x540870 · 0x54088c) · 0x540678[band] (:656)
  2. IIR: FUN_18052d650(state=0x440518, out=0x5406f8, in=0x540678[band]) → smoother (:668)
  3. online: blend & weight into mask: 0x5406f8 = 0x540698·(1−mix) 006e40 mix=0x54087c (:814) 0x5406f8 += mix·0.8 015060 c3e28=0.8 (:823) 0x540678[band] = bigkernel(0x540678[band],0x5406f8) 26b820 (:832) 0x5407c8[band] = combine(0x5407c8[band],0x540678[band],0x5406f8) 00dc40 (:843) mirror 0x5406f8 halves (011940, n and n+stride4) (:852 861) WEIGHTS: 0x5407c8[band] += 0x5406c8·0x5406f8_upper 003c40(stride4) (:869) 0x5407c8[band] += 0x5406e8·0x5406f8_lower 003c40 (:877) 0x5407c8[band] += 0x540678[band] 005a20 (:885)
  4. WARP (TILT): 0x540678[band] *= 0x5406a8 008700 (:938,:947)
  5. dry/wet: 0x540678[band] = mask·(fVar30·0x540888) + (1−fVar30) fVar30=0x540874−rnd (:1184,:1193)
  6. FFT-conv: FUN_180535a70(0x540628, mask, n+1) fwd-FT → window×0x540658 (52d990) → inv-FT → impulse 0x540668, DC=(1.0,0.0) (:1245) → ×0x540888 → conv(impulse, audio param_2) → out

THE TILT (replaces empirical {500:1.414,1000:1.454,2000:1.795})

warp 0x5406a8 = 0.87·x/(1+x/K), K=exp(2.0723267)≈7.942, x = f_bin/2000 [c3e50=0.87, c4208, c45b4=2000] warp(500)=0.211 warp(1000)=0.409 warp(2000)=0.773 (linear depth ratio 2000/500 = 3.67) applied directly to the FLOAT mask before FFT-conv ⇒ enters the dB via the impulse response. NOTE: 3.67 linear is ≫ the fitted tilt ratio (1.27) ⇒ the rest comes from the LUT-level flattening (step 5 dry/wet + 0x540888) and the level sidechain 0x563xxx — that is the Phase-5 step-4 integration.

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