diff --git a/radio/processor/src/Block.hpp b/radio/processor/src/Block.hpp
index 86427c5..ee648cc 100644
--- a/radio/processor/src/Block.hpp
+++ b/radio/processor/src/Block.hpp
@@ -22,6 +22,11 @@ class Block
 	virtual ~Block() = default;
 	
 	virtual void process() = 0;
+	virtual IBuffer* buffer_in(size_t index=0) = 0;
+	IBuffer* buffer_out(size_t index=0)
+	{
+		return m_buf_out;
+	}
 
 	size_t num_in()
 	{
@@ -33,16 +38,11 @@ class Block
   		return m_num_out;
 	}
 	
-	void addBuffer(IBuffer *out)
+	void buffer_out_add(IBuffer *out)
 	{
 		m_buf_out = out;
 	}
 
-	virtual IBuffer* buffer()
-	{
-		return nullptr;
-	}
-	
 	protected:
 	size_t m_num_in;
 	size_t m_num_out;