diff --git a/src/audioprocessor.hxx b/src/audioprocessor.hxx
new file mode 100644
index 0000000..56a8c85
--- /dev/null
+++ b/src/audioprocessor.hxx
@@ -0,0 +1,31 @@
+
+#ifndef LUPPP_AUDIO_PROCESSOR_H
+#define LUPPP_AUDIO_PROCESSOR_H
+
+class AudioProcessor
+{
+  public:
+    AudioProcessor(){}
+    
+    /// copies the track output to master buffer, sidechain & post-side buffer
+    virtual void process(int nframes, Buffers* buffers)
+    {
+      
+      
+    }
+    
+    virtual ~AudioProcessor(){};
+  
+  private:
+    int track;
+    
+    float _toMaster;
+    
+    float _toReverb;
+    float _toSidechain;
+    float _toPostSidechain;
+  
+};
+
+#endif // LUPPP_AUDIO_PROCESSOR_H
+
diff --git a/src/looper.hxx b/src/looper.hxx
index 6dd6481..30c04c0 100644
--- a/src/looper.hxx
+++ b/src/looper.hxx
@@ -6,6 +6,7 @@
 #include <iostream>
 
 #include "buffers.hxx"
+#include "audioprocessor.hxx"
 #include "observer/observer.hxx"
 
 #define SAMPLE_SIZE 44100*60
@@ -14,7 +15,7 @@ class AudioBuffer;
 
 using namespace std;
 
-class Looper : public Observer // for notifications
+class Looper : public AudioProcessor, public Observer // for notifications
 {
   public:
     enum State {
diff --git a/src/trackoutput.hxx b/src/trackoutput.hxx
new file mode 100644
index 0000000..0b82f19
--- /dev/null
+++ b/src/trackoutput.hxx
@@ -0,0 +1,40 @@
+
+#ifndef LUPPP_TRACK_OUTPUT_H
+#define LUPPP_TRACK_OUTPUT_H
+
+class TrackOutput
+{
+  public:
+    TrackOutput(int t, AudioProcessor* ap) :
+      track(t),
+      previousInChain(ap),
+    {
+    }
+    
+    /// copies the track output to master buffer, sidechain & post-side buffer
+    void process(int nframes, Buffers* buffers)
+    {
+      ap->process( nframes, buffers );
+      
+      for(int i = 0; i < nframes; i++)
+      {
+        // copy data here
+      }
+    }
+  
+  private:
+    int track;
+    
+    float _toMaster;
+    
+    float _toReverb;
+    float _toSidechain;
+    float _toPostSidechain;
+    
+    /// Pointer to "previous" processor: the graph is backwards
+    AudioProcessor* previousInChain;
+  
+};
+
+#endif // LUPPP_TRACK_OUTPUT_H
+