diff --git a/dsp/fn529fe0.cpp b/dsp/fn529fe0.cpp
index f5ec779..9d0033d 100644
--- a/dsp/fn529fe0.cpp
+++ b/dsp/fn529fe0.cpp
@@ -197,8 +197,10 @@ void cascade_detect(
 // per-frame band ACC_i vectors for step 10 (dc40).
 
 void chain_9_19(float* bands, float* tmp6f8, float* accVec,
-                const float* warp, const float* att, const float* rel,
-                size_t nbin) {
+                 const float* warp, const float* att, const float* rel,
+                 size_t nbin) {
+    // pre: LOG#1 140980 logf on [678i] 52a63a (BLOCKMAP:629) — before 9a
+    for (size_t i = 0; i < nbin; i++) bands[i] = std::log(std::max(bands[i], 1e-30f));
     // 9a: vec698 *= (1 - param87c) → zero при дефолтах (param=1.0)
     // 9b: vec6f8 += param87c*0.8  @1824c3e28 (BLOCKMAP:589)
     // 9c: DIVIDE dst=678i A=bands B=6f8  1803a06a0 vpermps (BLOCKMAP:580)
@@ -217,8 +219,9 @@ void chain_9_19(float* bands, float* tmp6f8, float* accVec,
     // 14: EXP#1 180296c80 expf + +=(-1) th2270 (24mm2 order fix)
     for (size_t i = 0; i < nbin; i++) bands[i] = expf_180296c80(bands[i]) - 1.0f;
     // 15: array-mul track*  th2000
-    // 16: *=kWarp + LOG#2 140980 (placeholder warp already passed)
+    // 16: *=kWarp 52ae8f + LOG#2 140980 logf 52aefd (BLOCKMAP:638)
     for (size_t i = 0; i < nbin; i++) bands[i] *= warp[i];
+    for (size_t i = 0; i < nbin; i++) bands[i] = std::log(std::max(bands[i], 1e-30f));
     // 17: EXP#2 + exp-variant 140a40/140b00
     for (size_t i = 0; i < nbin; i++) bands[i] = expf_180296c80(bands[i]);
 }