=== modified file 'mixxx/src/engine/enginefilterblock.cpp'
--- mixxx/src/engine/enginefilterblock.cpp	2012-07-04 05:37:09 +0000
+++ mixxx/src/engine/enginefilterblock.cpp	2012-12-24 20:29:42 +0000
@@ -118,6 +118,10 @@
     memset(m_pTemp1, 0, sizeof(CSAMPLE) * MAX_BUFFER_LEN);
     memset(m_pTemp2, 0, sizeof(CSAMPLE) * MAX_BUFFER_LEN);
     memset(m_pTemp3, 0, sizeof(CSAMPLE) * MAX_BUFFER_LEN);
+
+    m_lowFinal = m_midFinal = m_highFinal = 0.f;
+    m_lowCur = m_midCur = m_highCur = 0.f;
+    m_step = 0.05;
 }
 
 EngineFilterBlock::~EngineFilterBlock()
@@ -177,6 +181,59 @@
     if (filterKillHigh->get()==0.)
         fHigh = filterpotHigh->get(); //*1.2;
 
+    if (fLow != m_lowFinal)
+	    m_lowFinal = fLow;
+    if (fMid != m_midFinal)
+	    m_midFinal = fMid;
+    if (fHigh != m_highFinal)
+	    m_highFinal = fHigh;
+
+    if (m_lowCur > m_lowFinal)
+    {
+    	if (m_lowCur - m_lowFinal > m_step)
+		m_lowCur -= m_step;
+	else
+		m_lowCur = m_lowFinal;
+    }
+    else if (m_lowCur < m_lowFinal)
+    {
+    	if (m_lowFinal - m_lowCur > m_step)
+		m_lowCur += m_step;
+	else
+		m_lowCur = m_lowFinal;
+    }
+
+    if (m_midCur > m_midFinal)
+    {
+    	if (m_midCur - m_midFinal > m_step)
+		m_midCur -= m_step;
+	else
+		m_midCur = m_midFinal;
+    }
+    else if (m_midCur < m_midFinal)
+    {
+    	if (m_midFinal - m_midCur > m_step)
+		m_midCur += m_step;
+	else
+		m_midCur = m_midFinal;
+    }
+
+
+    if (m_highCur > m_highFinal)
+    {
+    	if (m_highCur - m_highFinal > m_step)
+		m_highCur -= m_step;
+	else
+		m_highCur = m_highFinal;
+    }
+    else if (m_highCur < m_highFinal)
+    {
+    	if (m_highFinal - m_highCur > m_step)
+		m_highCur += m_step;
+	else
+		m_highCur = m_highFinal;
+    }
+
 #ifndef __LOFI__
     setFilters();
 #endif
@@ -186,8 +243,8 @@
     high->process(pIn, m_pTemp3, iBufferSize);
 
     SampleUtil::copy3WithGain(pOutput,
-                              m_pTemp1, fLow,
-                              m_pTemp2, fMid,
-                              m_pTemp3, fHigh, iBufferSize);
+                              m_pTemp1, m_lowCur,
+                              m_pTemp2, m_midCur,
+                              m_pTemp3, m_highCur, iBufferSize);
 }
 

=== modified file 'mixxx/src/engine/enginefilterblock.h'
--- mixxx/src/engine/enginefilterblock.h	2012-07-04 05:37:09 +0000
+++ mixxx/src/engine/enginefilterblock.h	2012-12-24 20:15:04 +0000
@@ -61,6 +61,10 @@
 
     int ilowFreq, ihighFreq;
     bool blofi;
+
+    float m_lowFinal, m_midFinal, m_highFinal;
+    float m_lowCur, m_midCur, m_highCur;
+    float m_step;
 };
 
 #endif