skip out of calculations when input==0

SpiralSound/Plugins/MoogFilterPlugin/MoogFilterPlugin.C

@@ -60,7 +60,7 @@ f(0.0f),
 p(0.0f),
 q(0.0f),
 b0(0.1f),
-b1(0.1f),
+b1(0.0f),
 b2(0.0f),
 b3(0.0f),
 b4(0.0f),
@@ -135,28 +135,47 @@ void MoogFilterPlugin::Execute()
 			Q = ((Resonance+GetInput(2,n))*6)-3.0f;
 			q = Q + (1.0f + 0.5f * q * (1.0f - q + 5.6f * q * q));
 		}
-		
+
 		in = GetInput(0,n);
-				
-		in -= q * b4;
-		
-		if (in>1) in=1;
-		if (in<-1) in=-1;
-								
-		t1 = b1; b1 = (in + b0) * p - b1 * f;
-		t2 = b2; b2 = (b1 + t1) * p - b2 * f;
-		t1 = b3; b3 = (b2 + t2) * p - b3 * f;		
-     		     b4 = (b3 + t1) * p - b4 * f;	
-		b4 = b4 - b4 * b4 * b4 * 0.166667f;
 		
-		b0 = in;	
-		 
-		SetOutput(0,n,b4);	 
-		SetOutput(1,n,(in-b4));
-		SetOutput(2,n,3.0f * (b3 - b4));	
+		if (in == 0)
+		{
+			Clear();
+			SetOutput(0,n,0);	 
+	  		SetOutput(1,n,0);
+			SetOutput(2,n,0);	
+		} else {				
+			in -= q * b4;
+			
+			if (in>1) in=1;
+			if (in<-1) in=-1;
+									
+			t1 = b1; b1 = (in + b0) * p - b1 * f;
+			t2 = b2; b2 = (b1 + t1) * p - b2 * f;
+			t1 = b3; b3 = (b2 + t2) * p - b3 * f;		
+     			     b4 = (b3 + t1) * p - b4 * f;	
+			b4 = b4 - b4 * b4 * b4 * 0.166667f;
+			
+			b0 = in;	
+			 
+			SetOutput(0,n,b4);	 
+			SetOutput(1,n,(in-b4));
+			SetOutput(2,n,3.0f * (b3 - b4));	
+		}
 	}			
 }
-	
+
+void MoogFilterPlugin::Clear()
+{
+	b0 = 0.0f;
+	b1 = 0.0f;
+	b2 = 0.0f;
+	b3 = 0.0f;
+	b4 = 0.0f;
+	t1 = 0.0f;
+	t2 = 0.0f;
+}
+
 void MoogFilterPlugin::Randomise()
 {
 }

SpiralSound/Plugins/MoogFilterPlugin/MoogFilterPlugin.h

@@ -37,6 +37,7 @@ public:
 	float GetCutoff()    { return Cutoff; }
 	float GetResonance() { return Resonance;  } 
 	
+	void Clear();
 	void Randomise();
 
 private:

SpiralSound/Plugins/SVFilterPlugin/SVFilterPlugin.C

@@ -115,14 +115,19 @@ void SVFilterPlugin::Execute()
 
 		in = GetInput(0,n);
 
-		float scale=0.5f;
-
-		m_l = m_l + m_f*m_b;
-		m_h = scale*in - m_l - q*m_b;
-		m_b = m_b + m_f*m_h;
-		m_n = m_l + m_h;
-		m_p = m_l - m_h;
-
+		if (in == 0)
+			Clear();	 
+		else 
+		{				
+			float scale=0.5f;
+
+			m_l = m_l + m_f*m_b;
+			m_h = scale*in - m_l - q*m_b;
+			m_b = m_b + m_f*m_h;
+			m_n = m_l + m_h;
+			m_p = m_l - m_h;
+		}
+		
 		SetOutput(0,n,m_l);
 		SetOutput(1,n,m_b);
 		SetOutput(2,n,m_h);
@@ -156,7 +161,7 @@ void SVFilterPlugin::StreamIn (istream &s) {
 void SVFilterPlugin::Clear()
 {
 	m_h=0.0f;
-	m_b=0.1f;
+	m_b=0.0f;
 	m_l=0.0f;
 	m_p=0.0f;
 	m_n=0.0f;