diff --git a/src/event.hxx b/src/event.hxx
index 1395365..9828d80 100644
--- a/src/event.hxx
+++ b/src/event.hxx
@@ -57,9 +57,10 @@ class EventLooperState : public EventBase
     int type() { return int(LOOPER_STATE); }
     uint32_t size() { return sizeof(EventLooperState); }
     
+    int track;
     Looper::State state;
     EventLooperState(){}
-    EventLooperState(Looper::State s) : state(s){}
+    EventLooperState(int t, Looper::State s) : track(t), state(s){}
 };
 
 class EventLoadSample : public EventBase
diff --git a/src/eventhandlerdsp.cxx b/src/eventhandlerdsp.cxx
index d979ebb..d733034 100644
--- a/src/eventhandlerdsp.cxx
+++ b/src/eventhandlerdsp.cxx
@@ -60,7 +60,7 @@ void handleDspEvents()
           if ( availableRead >= sizeof(EventLooperState) ) {
             EventLooperState ev;
             jack_ringbuffer_read( rbToDsp, (char*)&ev, sizeof(EventLooperState) );
-            jack->setLooperState( 0, ev.state );
+            jack->setLooperState( ev.track, ev.state );
           } break; }
         default:
           {
diff --git a/src/gtrack.hxx b/src/gtrack.hxx
index 2ef04c9..4e5be1f 100644
--- a/src/gtrack.hxx
+++ b/src/gtrack.hxx
@@ -18,23 +18,28 @@
 using namespace std;
 
 static void button_callback(Fl_Widget *w, void *data) {
-  cout << "Button " << w->label() << " clicked" << endl;
+  int track = *(int*)data;
+  cout << "Button " << *(int*)data << w->label() << " clicked" << endl;
   
   if ( strcmp( w->label() , "Rec" ) == 0 )
   {
-    EventLooperState e = EventLooperState(Looper::STATE_RECORDING);
+    EventLooperState e = EventLooperState(track,Looper::STATE_RECORDING);
     writeToDspRingbuffer( &e );
   }
   else if ( strcmp( w->label() , "Play" ) == 0 )
   {
-    EventLooperState e = EventLooperState(Looper::STATE_PLAYING);
+    EventLooperState e = EventLooperState(track,Looper::STATE_PLAYING);
     writeToDspRingbuffer( &e );
   }
   else if ( strcmp( w->label() , "Stop" ) == 0 )
   {
-    EventLooperState e = EventLooperState(Looper::STATE_STOPPED);
+    EventLooperState e = EventLooperState(track,Looper::STATE_STOPPED);
     writeToDspRingbuffer( &e );
   }
+  else
+  {
+    cout << __FILE__ << __LINE__ << " Error: unknown command string" << endl;
+  }
 }
 
 class GTrack : public Fl_Group
@@ -56,12 +61,14 @@ class GTrack : public Fl_Group
       dial2(x+45, y +155, 24, 24, "B"),
       dial3(x+75, y +155, 24, 24, "C")
     {
-      button1.callback( button_callback, 0 );
-      button2.callback( button_callback, 0 );
-      button3.callback( button_callback, 0 );
-      button4.callback( button_callback, 0 );
-      button5.callback( button_callback, 0 );
-      button6.callback( button_callback, 0 );
+      ID = privateID++;
+      
+      button1.callback( button_callback, &ID );
+      button2.callback( button_callback, &ID );
+      button3.callback( button_callback, &ID );
+      button4.callback( button_callback, &ID );
+      button5.callback( button_callback, &ID );
+      button6.callback( button_callback, &ID );
       
       end(); // close the group
     }
@@ -73,6 +80,8 @@ class GTrack : public Fl_Group
     
   
   private:
+    int ID;
+    
     char* title;
     
     Avtk::Background bg;
diff --git a/src/jack.cxx b/src/jack.cxx
index ea1b98a..b6bf114 100644
--- a/src/jack.cxx
+++ b/src/jack.cxx
@@ -47,8 +47,8 @@ Jack::Jack()
     cerr << "Jack() error setting timebase callback" << endl;
   }
   
-  
-  loopers.push_back( new Looper() );
+  for(int i = 0; i < 5; i++)
+    loopers.push_back( new Looper(i) );
   
   jack_transport_start(client);
 }
@@ -72,8 +72,8 @@ int Jack::process (jack_nframes_t nframes)
   // pre-zero output buffers
   memset( buffers.audio[Buffers::MASTER_OUTPUT], 0, sizeof(float) * nframes );
   
-  
-  loopers.at(0)->process(nframes, &buffers );
+  for(int i = 0; i < loopers.size(); i++)
+    loopers.at(i)->process( nframes, &buffers );
   
   /*
   float* input = buffers.audio[Buffers::MASTER_INPUT];
diff --git a/src/jack.hxx b/src/jack.hxx
index fabfbc0..cae95e8 100644
--- a/src/jack.hxx
+++ b/src/jack.hxx
@@ -31,9 +31,9 @@ class Jack
     int getBuffersize();
     int getSamplerate();
     
-    void setLooperState(int, Looper::State s)
+    void setLooperState(int t, Looper::State s)
     {
-      loopers.at(0)->setState(s);
+      loopers.at(t)->setState(s);
     }
   
   private:
diff --git a/src/looper.hxx b/src/looper.hxx
index 1026a67..5cabad2 100644
--- a/src/looper.hxx
+++ b/src/looper.hxx
@@ -17,7 +17,8 @@ class Looper
       STATE_STOPPED,
     };
     
-    Looper() :
+    Looper(int t) :
+      track(t),
       state(STATE_STOPPED),
       endPoint   (0),
       playPoint  (0)
@@ -83,6 +84,7 @@ class Looper
     }
   
   private:
+    int track;
     State state;
     
     int endPoint, playPoint, lastWrittenSampleIndex;