diff --git a/radio/processor/src/Block.hpp b/radio/processor/src/Block.hpp
index 3f3dc8d..061b3a6 100644
--- a/radio/processor/src/Block.hpp
+++ b/radio/processor/src/Block.hpp
@@ -2,7 +2,7 @@
 #define __RADIO_BLOCK_H__
 
 #include <forward_list>
-#include <exception>
+#include "Exception.hpp"
 #include "Buffer.hpp"
 
 namespace Processor
@@ -23,6 +23,7 @@ class Block
 	virtual ~Block() = default;
 	
 	virtual void process() = 0;
+	virtual void prepare() {}
 
 	size_t num_in() const
 	{
@@ -54,7 +55,7 @@ class Block
 		}
 		if (!buf)
 		{
-			throw Exception("buffer_in() failed!");
+			EXC_EXCEPT(-1);
 		}
 		return buf;
 	}
@@ -69,7 +70,7 @@ class Block
 		}
 		if (!buf)
 		{
-			throw Exception("buffer_out() failed!");
+			EXC_EXCEPT(-1);
 		}
 		return buf;
 	}
diff --git a/radio/processor/src/Buffer.hpp b/radio/processor/src/Buffer.hpp
index 5e5dabf..bdb77a4 100644
--- a/radio/processor/src/Buffer.hpp
+++ b/radio/processor/src/Buffer.hpp
@@ -3,7 +3,6 @@
 
 #include <stddef.h>
 #include <string.h>
-#include <exception>
 #include <algorithm>
 #include "Exception.hpp"