engine almost working, backup before adding gas types.

Core/SoundProcessor.cs

@@ -23,7 +23,7 @@ namespace FluidSim.Core
             scaleFactor = 1.0 / (4.0 * Math.PI * listenerDistanceMeters);
 
             // Smoothing time constant for the derivative: 10 ms (much smoother)
-            double tau = 0.010;   // 10 ms
+            double tau = 0.005;   // 10 ms
             alpha = Math.Exp(-dt / tau);
 
             // Low‑pass time constant for the mass flow: 5 ms (kneecap high‑freq directly)
@@ -49,7 +49,7 @@ namespace FluidSim.Core
             double pressure = smoothDMdt * scaleFactor * Gain;
 
             // Soft clip to ±1 (should rarely trigger now)
-            return (float)Math.Tanh(pressure);
+            return (float)pressure;
         }
     }
 }