diff --git a/src/process/ScopeVisualProcessor.h b/src/process/ScopeVisualProcessor.h
index e5dd56c..e8d411b 100644
--- a/src/process/ScopeVisualProcessor.h
+++ b/src/process/ScopeVisualProcessor.h
@@ -3,35 +3,54 @@
 #include "VisualProcessor.h"
 #include "AudioThread.h"
 
-class ScopeVisualProcessor : public VisualProcessor {
-protected:
-    std::vector<float> waveform_points;
+class ScopeRenderData: public ReferenceCounter {
+public:
+	std::vector<float> waveform_points;
+	int channels;
+};
 
+typedef ThreadQueue<ScopeRenderData *> ScopeRenderDataQueue;
+
+class ScopeVisualProcessor : public VisualProcessor<AudioThreadInputQueue, ScopeRenderDataQueue, ScopeRenderData> {
+protected:
     virtual void process() {
+    	if (isOutputEmpty()) {
+    		return;
+    	}
         if (!input->empty()) {
-            ReferenceCounter *ati_ref;
-            input->pop(ati_ref);
-            
-            AudioThreadInput *ati = (AudioThreadInput *)ati_ref;
-            if (!ati) {
+            AudioThreadInput *audioInputData;
+            input->pop(audioInputData);
+
+            if (!audioInputData) {
                 return;
             }
-            int iMax = ati->data.size();
+            int iMax = audioInputData->data.size();
             if (!iMax) {
-                ati->decRefCount();
+                audioInputData->decRefCount();
                 return;
             }
-            if (waveform_points.size() != iMax * 2) {
-                waveform_points.resize(iMax * 2);
+
+            ScopeRenderData *renderData = outputBuffers.getBuffer();
+            renderData->channels = audioInputData->channels;
+
+            if (renderData->waveform_points.size() != iMax * 2) {
+            	renderData->waveform_points.resize(iMax * 2);
             }
             
             for (int i = 0; i < iMax; i++) {
-                waveform_points[i * 2 + 1] = ati->data[i] * 0.5f;
-                waveform_points[i * 2] = ((double) i / (double) iMax);
+            	renderData->waveform_points[i * 2 + 1] = audioInputData->data[i] * 0.5f;
+            	renderData->waveform_points[i * 2] = ((double) i / (double) iMax);
             }
             
+            distribute(renderData);
             // ati->channels
         }
+    }
+
+    ReBuffer<ScopeRenderData> outputBuffers;
+};
+
+
 /*
  if (!wxGetApp().getAudioVisualQueue()->empty()) {
             AudioThreadInput *demodAudioData;
@@ -59,5 +78,3 @@ protected:
             }
         }
 */
-    }
-};
\ No newline at end of file
diff --git a/src/process/SpectrumVisualProcessor.h b/src/process/SpectrumVisualProcessor.h
index 20fa627..76d0789 100644
--- a/src/process/SpectrumVisualProcessor.h
+++ b/src/process/SpectrumVisualProcessor.h
@@ -1,8 +1,13 @@
 #pragma once
 
 #include "VisualProcessor.h"
+#include "SpectrumCanvas.h"
 
-class SpectrumVisualProcessor : public VisualProcessor {
+class SpectrumVisualData : public ReferenceCounter {
+
+};
+
+class SpectrumVisualProcessor : public VisualProcessor<DemodulatorThreadIQData, SpectrumVisualData> {
 protected:
     virtual void process() {
         /*
@@ -82,4 +87,4 @@ protected:
         }
 */
     }
-};
\ No newline at end of file
+};
diff --git a/src/process/VisualProcessor.h b/src/process/VisualProcessor.h
index 5ca4b7d..f6c876e 100644
--- a/src/process/VisualProcessor.h
+++ b/src/process/VisualProcessor.h
@@ -5,27 +5,30 @@
 #include "IOThread.h"
 #include <algorithm>
 
-typedef ThreadQueue<ReferenceCounter *> VisualDataQueue;
-
+template<class InputQueueType = ThreadQueueBase, class OutputQueueType = ThreadQueueBase, class OutputDataType = ReferenceCounter>
 class VisualProcessor {
 public:
-    void setInput(VisualDataQueue *vis_in) {
+	virtual ~VisualProcessor() {
+
+	}
+
+    void setInput(InputQueueType *vis_in) {
         busy_update.lock();
         input = vis_in;
         busy_update.unlock();
     }
     
-    void attachOutput(VisualDataQueue *vis_out) {
+    void attachOutput(OutputQueueType *vis_out) {
         // attach an output queue
         busy_update.lock();
         outputs.push_back(vis_out);
         busy_update.unlock();
     }
     
-    void removeOutput(VisualDataQueue *vis_out) {
+    void removeOutput(OutputQueueType *vis_out) {
         // remove an output queue
         busy_update.lock();
-        std::vector<VisualDataQueue *>::iterator i = std::find(outputs.begin(), outputs.end(), vis_out);
+        typename std::vector<OutputQueueType *>::iterator i = std::find(outputs.begin(), outputs.end(), vis_out);
         if (i != outputs.end()) {
             outputs.erase(i);
         }
@@ -46,29 +49,53 @@ protected:
         // distribute(output);
     }
 
-    void distribute(ReferenceCounter *output) {
+    void distribute(OutputDataType *output) {
         // distribute outputs
         output->setRefCount(outputs.size());
-        std::vector<VisualDataQueue *>::iterator outputs_i;
         for (outputs_i = outputs.begin(); outputs_i != outputs.begin(); outputs_i++) {
-            (*outputs_i)->push(output);
+        	if ((*outputs_i)->full()) {
+        		output->decRefCount();
+        	} else {
+        		(*outputs_i)->push(output);
+        	}
         }
     }
     
-    VisualDataQueue * input;
-    std::vector<VisualDataQueue *> outputs;
+    bool isOutputEmpty() {
+        for (outputs_i = outputs.begin(); outputs_i != outputs.begin(); outputs_i++) {
+            if (!(*outputs_i)->empty()) {
+            	return false;
+            }
+        }
+        return true;
+    }
+
+    bool isAnyOutputEmpty() {
+        for (outputs_i = outputs.begin(); outputs_i != outputs.begin(); outputs_i++) {
+            if ((*outputs_i)->empty()) {
+            	return true;
+            }
+        }
+        return false;
+    }
+
+    InputQueueType *input;
+    std::vector<OutputQueueType *> outputs;
+	typename std::vector<OutputQueueType *>::iterator outputs_i;
     std::mutex busy_update;
 };
 
 
-class VisualDataDistributor : public VisualProcessor {
+template<class QueueType = ThreadQueueBase, class OutputDataType = ReferenceCounter>
+class VisualDataDistributor : public VisualProcessor<QueueType, QueueType, OutputDataType> {
 protected:
-    virtual void process() {
-        while (!input->empty()) {
-            ReferenceCounter *inp;
-            input->pop(inp);
+    void process() {
+
+        while (!VisualProcessor<QueueType, QueueType, OutputDataType>::input->empty()) {
+        	ReferenceCounter *inp;
+        	VisualProcessor<QueueType, QueueType, OutputDataType>::input->pop(inp);
             if (inp) {
-                distribute(inp);
+            	VisualProcessor<QueueType, QueueType, OutputDataType>::distribute(inp);
             }
         }
     }
diff --git a/src/process/WaterfallVisualProcessor.h b/src/process/WaterfallVisualProcessor.h
index b33c37e..2fabeba 100644
--- a/src/process/WaterfallVisualProcessor.h
+++ b/src/process/WaterfallVisualProcessor.h
@@ -1,9 +1,13 @@
 #pragma once
 
 #include "VisualProcessor.h"
+#include "WaterfallCanvas.h"
 
+class WaterfallVisualData : public ReferenceCounter {
 
-class WaterfallVisualProcessor : public VisualProcessor {
+};
+
+class WaterfallVisualProcessor : public VisualProcessor<DemodulatorThreadIQData, WaterfallVisualData> {
 protected:
     virtual void process() {
 /*
@@ -278,4 +282,4 @@ protected:
         }
 */
     }
-};
\ No newline at end of file
+};
diff --git a/src/util/ThreadQueue.h b/src/util/ThreadQueue.h
index 6ef108a..67247a6 100644
--- a/src/util/ThreadQueue.h
+++ b/src/util/ThreadQueue.h
@@ -211,6 +211,15 @@ public:
         return m_queue.empty();
     }
 
+    /**
+     *  Check if the queue is empty.
+     * \return true if queue is empty.
+     */
+    bool full() const {
+        std::lock_guard < std::mutex > lock(m_mutex);
+        return m_queue.size() >= m_max_num_items;
+    }
+
     /**
      *  Remove any items in the queue.
      */