diff --git a/engine/MUNGA/AUDIO.cpp b/engine/MUNGA/AUDIO.cpp
index f2d96e0..60232e3 100644
--- a/engine/MUNGA/AUDIO.cpp
+++ b/engine/MUNGA/AUDIO.cpp
@@ -132,7 +132,21 @@ void
 	//
 	// Increment frame counter
 	//
-	audioFrameCount = Now().ticks;
+	// AUDIO CLOCK CALIBRATION FIX: AudioTime consumers (sequence event timing,
+	// compression curves) assume audioFrameCount advances at the renderer's
+	// calibrationRate (DefaultRendererRate = 30 frames/sec:
+	// Seconds_To_Frames = s * rate).  The WinTesla port set raw Now().ticks here
+	// (~hundreds/sec), running sequences ~18x off the authored timing -- the
+	// AudioControlSequence events carrying the real footstep volumes never
+	// landed where authored.  Convert ticks -> calibrated frames properly.
+	{
+		double tps = (double)SystemClock::GetTicksPerSecond();
+		if (tps <= 0.0) tps = 1000.0;	// GetTickCount ms fallback (static not yet measured)
+		audioFrameCount = (AudioFrameCount)(
+			(double)Now().ticks
+			* (double)application->GetAudioRenderer()->GetCalibrationRate()
+			/ tps);
+	}
 	Verify(audioFrameCount < LONG_MAX);
 	if (getenv("BT_AUDIO_SPATIAL")) { static long s_hx=0; if ((++s_hx % 300)==0)
 		DEBUG_STREAM << "[audioclock] frame=" << audioFrameCount << " execs=" << s_hx << "\n" << std::flush; }
diff --git a/game/reconstructed/btl4app.cpp b/game/reconstructed/btl4app.cpp
index 1b6a2c9..08c5e04 100644
--- a/game/reconstructed/btl4app.cpp
+++ b/game/reconstructed/btl4app.cpp
@@ -290,6 +290,17 @@ BTL4Application::SharedData
 			divisionParameters
 				? (RendererRate)*reinterpret_cast<float*>(divisionParameters + 0x10)
 				: (RendererRate)1000.0f;
+		// DATABINDING GUARD (task #50): divisionParameters is a raw engine block
+		// pointer and +0x10 is a 1995-layout offset; on the port it read GARBAGE
+		// (-1.6e14 measured), poisoning calibrationRate -> every AudioTime
+		// conversion (sequence event scheduling, compression durations) broke,
+		// which is why AudioControlSequence timeline events (footstep volumes!)
+		// never landed.  Sanity-clamp to the authored 1000 frames/sec default.
+		if (!(sample_rate > 0.0f && sample_rate <= 100000.0f))
+			sample_rate = (RendererRate)1000.0f;
+		if (getenv("BT_AUDIO_LOG"))
+			DEBUG_STREAM << "[audio] renderer sample_rate=" << sample_rate
+				<< " (divisionParameters=" << (void*)divisionParameters << ")" << "\n" << std::flush;
 
 		return
 			new BTL4AudioRenderer(