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diff --git a/libs/ardour/ardour/processor.h b/libs/ardour/ardour/processor.h
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+++ b/libs/ardour/ardour/processor.h
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+/*
+    Copyright (C) 2000 Paul Davis 
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __ardour_processor_h__
+#define __ardour_processor_h__
+
+#include <vector>
+#include <string>
+#include <exception>
+
+#include <pbd/statefuldestructible.h> 
+
+#include <sigc++/signal.h>
+
+#include <ardour/types.h>
+#include <ardour/ardour.h>
+#include <ardour/plugin_state.h>
+#include <ardour/buffer_set.h>
+#include <ardour/automatable.h>
+
+
+class XMLNode;
+
+namespace ARDOUR {
+
+class Session;
+
+/* A mixer strip element - plugin, send, meter, etc.
+ */
+class Processor : public Automatable
+{
+  public:
+	static const string state_node_name;
+
+	Processor(Session&, const string& name, Placement p); // TODO: remove placement in favour of sort key
+	
+	virtual ~Processor() { }
+	
+	static boost::shared_ptr<Processor> clone (boost::shared_ptr<const Processor>);
+
+	uint32_t sort_key() const { return _sort_key; }
+	void set_sort_key (uint32_t key);
+
+	Placement placement() const { return _placement; }
+	void set_placement (Placement);
+	
+	bool active () const { return _active; }
+	void set_active (bool yn);
+	
+	bool get_next_ab_is_active () const { return _next_ab_is_active; }
+	void set_next_ab_is_active (bool yn) { _next_ab_is_active = yn; }
+	
+	virtual nframes_t latency() { return 0; }
+	
+	virtual void transport_stopped (nframes_t frame) {}
+	
+	virtual void set_block_size (nframes_t nframes) {}
+
+	virtual void run (BufferSet& bufs, nframes_t start_frame, nframes_t end_frame, nframes_t nframes, nframes_t offset) = 0;
+	virtual void silence (nframes_t nframes, nframes_t offset) {}
+	
+	virtual void activate () { _active = true; ActiveChanged.emit(); }
+	virtual void deactivate () { _active = false; ActiveChanged.emit(); }
+	
+	virtual bool configure_io (ChanCount in, ChanCount out) { _configured_input = in; return (_configured = true); }
+
+	/* Act as a pass through, if not overridden */
+	virtual bool      can_support_input_configuration (ChanCount in) const { return true; }
+	virtual ChanCount output_for_input_configuration (ChanCount in) const { return in; }
+	virtual ChanCount output_streams() const { return _configured_input; }
+	virtual ChanCount input_streams () const { return _configured_input; }
+
+	virtual XMLNode& state (bool full);
+	virtual XMLNode& get_state (void);
+	virtual int set_state (const XMLNode&);
+	
+	void *get_gui () const { return _gui; }
+	void  set_gui (void *p) { _gui = p; }
+
+	static sigc::signal<void,Processor*> ProcessorCreated;
+
+	sigc::signal<void> ActiveChanged;
+	sigc::signal<void> PlacementChanged;
+
+protected:
+	bool      _active;
+	bool      _next_ab_is_active;
+	bool      _configured;
+	ChanCount _configured_input;
+	Placement _placement;
+	uint32_t  _sort_key;
+	void*     _gui;  /* generic, we don't know or care what this is */
+};
+
+} // namespace ARDOUR
+
+#endif /* __ardour_processor_h__ */