P4: multi-band FramedDetector (per-band twin res, sens-scaled GAIN, min-combine); tt_base 61.40%; min-combine wrong (soothe2 uses additive accumulator 0x5407c8)

dsp/harness.cpp

@@ -156,18 +156,21 @@ int main(int argc, char* argv[]) {
     }
 
     SpectralProcessor sp(2048, 512);
-    float fc = 500.0f;
-    float q = 1.0f;
-    if (!params.bands.empty()) {
-        for (const auto& b : params.bands) {
-            if (b.on > 0.5f && b.freq > 1.0f) {
-                fc = static_cast<float>(b.freq);
-                q = static_cast<float>(b.q > 0.0f ? b.q : 1.0f);
-                break;
-            }
+    std::vector<DetectorBand> bands;
+    for (const auto& b : params.bands) {
+        if (b.on > 0.5f && b.freq > 1.0f) {
+            DetectorBand db;
+            db.fc = static_cast<float>(b.freq);
+            db.q = static_cast<float>(b.q > 0.0f ? b.q : 1.0f);
+            db.sens = static_cast<float>(b.sens);
+            bands.push_back(db);
         }
     }
-    sp.setDetectorParams(fc, q);
+    if (bands.empty()) {
+        DetectorBand db{500.0f, 1.0f, 12.0f};
+        bands.push_back(db);
+    }
+    sp.setDetectorParams(bands);
 
     std::vector<float> left(frames, 0.0f), right(frames, 0.0f);
     encode_ms(left_in.data(), right_in.data(), frames);