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diff --git a/libs/ardour/ardour/audioregion.h b/libs/ardour/ardour/audioregion.h
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+++ b/libs/ardour/ardour/audioregion.h
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+/*
+    Copyright (C) 2000-2001 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.
+
+    $Id$
+*/
+
+#ifndef __ardour_audio_region_h__
+#define __ardour_audio_region_h__
+
+#include <vector>
+
+#include <pbd/fastlog.h>
+#include <pbd/undo.h>
+
+#include <ardour/ardour.h>
+#include <ardour/source.h>
+#include <ardour/gain.h>
+#include <ardour/region.h>
+#include <ardour/export.h>
+
+class XMLNode;
+
+namespace ARDOUR {
+
+class Route;
+class Playlist;
+class Session;
+class AudioFilter;
+
+struct AudioRegionState : public RegionState 
+{
+    AudioRegionState (std::string why);
+
+    Curve _fade_in;
+    Curve _fade_out;
+    Curve _envelope;
+    gain_t _scale_amplitude;
+    uint32_t _fade_in_disabled;
+    uint32_t _fade_out_disabled;
+};
+
+class AudioRegion : public Region
+{
+  public:
+	typedef vector<Source *> SourceList;
+
+	static Change FadeInChanged;
+	static Change FadeOutChanged;
+	static Change FadeInActiveChanged;
+	static Change FadeOutActiveChanged;
+	static Change EnvelopeActiveChanged;
+	static Change ScaleAmplitudeChanged;
+	static Change EnvelopeChanged;
+
+	AudioRegion (Source&, jack_nframes_t start, jack_nframes_t length, bool announce = true);
+	AudioRegion (Source&, jack_nframes_t start, jack_nframes_t length, const string& name, layer_t = 0, Region::Flag flags = Region::DefaultFlags, bool announce = true);
+	AudioRegion (SourceList &, jack_nframes_t start, jack_nframes_t length, const string& name, layer_t = 0, Region::Flag flags = Region::DefaultFlags, bool announce = true);
+	AudioRegion (const AudioRegion&, jack_nframes_t start, jack_nframes_t length, const string& name, layer_t = 0, Region::Flag flags = Region::DefaultFlags, bool announce = true);
+	AudioRegion (const AudioRegion&);
+	AudioRegion (Source&, const XMLNode&);
+	AudioRegion (SourceList &, const XMLNode&);
+	~AudioRegion();
+
+	bool region_list_equivalent (const AudioRegion&);
+	bool source_equivalent (const AudioRegion&);
+	bool equivalent (const AudioRegion&);
+	bool size_equivalent (const AudioRegion&);
+
+	void lock_sources ();
+	void unlock_sources ();
+	Source& source (uint32_t n=0) const { if (n < sources.size()) return *sources[n]; else return *sources[0]; } 
+
+	void set_scale_amplitude (gain_t);
+	gain_t scale_amplitude() const { return _scale_amplitude; }
+	
+	void normalize_to (float target_in_dB = 0.0f);
+
+	uint32_t n_channels() { return sources.size(); }
+	vector<string> master_source_names();
+	
+	bool envelope_active () const { return _flags & Region::EnvelopeActive; }
+	bool fade_in_active () const { return _flags & Region::FadeIn; }
+	bool fade_out_active () const { return _flags & Region::FadeOut; }
+	bool captured() const { return !(_flags & (Region::Flag (Region::Import|Region::External))); }
+
+	Curve& fade_in()  { return _fade_in; }
+	Curve& fade_out() { return _fade_out; }
+	Curve& envelope() { return _envelope; }
+
+	jack_nframes_t read_peaks (PeakData *buf, jack_nframes_t npeaks, jack_nframes_t offset, jack_nframes_t cnt, uint32_t chan_n=0, double samples_per_unit= 1.0) const;
+
+	virtual jack_nframes_t read_at (Sample *buf, Sample *mixdown_buffer, 
+					float *gain_buffer, jack_nframes_t position, jack_nframes_t cnt, 
+					uint32_t chan_n = 0,
+					jack_nframes_t read_frames = 0,
+					jack_nframes_t skip_frames = 0) const;
+
+	jack_nframes_t master_read_at (Sample *buf, Sample *mixdown_buffer, 
+				       float *gain_buffer, jack_nframes_t position, jack_nframes_t cnt, uint32_t chan_n=0) const;
+
+
+	XMLNode& state (bool);
+	XMLNode& get_state ();
+	int      set_state (const XMLNode&);
+
+	static void set_default_fade (float steepness, jack_nframes_t len);
+
+	enum FadeShape {
+		Linear,
+		Fast,
+		Slow,
+		LogA,
+		LogB,
+
+	};
+
+	void set_fade_in_active (bool yn);
+	void set_fade_in_shape (FadeShape);
+	void set_fade_in_length (jack_nframes_t);
+	void set_fade_in (FadeShape, jack_nframes_t);
+
+	void set_fade_out_active (bool yn);
+	void set_fade_out_shape (FadeShape);
+	void set_fade_out_length (jack_nframes_t);
+	void set_fade_out (FadeShape, jack_nframes_t);
+
+	void set_envelope_active (bool yn);
+
+	int separate_by_channel (ARDOUR::Session&, vector<AudioRegion*>&) const;
+
+	uint32_t read_data_count() const { return _read_data_count; }
+
+	ARDOUR::Playlist* playlist() const { return _playlist; }
+
+	UndoAction get_memento() const;
+
+	/* filter */
+
+	int apply (AudioFilter&);
+
+	/* export */
+
+	int exportme (ARDOUR::Session&, ARDOUR::AudioExportSpecification&);
+
+	Region* get_parent();
+
+	/* xfade/fade interactions */
+
+	void suspend_fade_in ();
+	void suspend_fade_out ();
+	void resume_fade_in ();
+	void resume_fade_out ();
+
+  private:
+	friend class Playlist;
+
+  private:
+	SourceList        sources;
+	SourceList        master_sources; /* used when timefx are applied, so 
+					     we can always use the original
+					     source.
+					  */
+	mutable Curve  	  _fade_in;
+	FadeShape         _fade_in_shape;
+	mutable Curve  	  _fade_out;
+	FadeShape         _fade_out_shape;
+	mutable Curve 	  _envelope;
+	gain_t            _scale_amplitude;
+	uint32_t          _fade_in_disabled;
+	uint32_t          _fade_out_disabled;
+
+	void set_default_fades ();
+	void set_default_fade_in ();
+	void set_default_fade_out ();
+	void set_default_envelope ();
+
+	StateManager::State* state_factory (std::string why) const;
+	Change restore_state (StateManager::State&);
+
+	void recompute_gain_at_end ();
+	void recompute_gain_at_start ();
+
+	bool copied() const { return _flags & Copied; }
+	void maybe_uncopy ();
+	void rename_after_first_edit ();
+
+	jack_nframes_t _read_at (const SourceList&, Sample *buf, Sample *mixdown_buffer, 
+				 float *gain_buffer, jack_nframes_t position, jack_nframes_t cnt, 
+				 uint32_t chan_n = 0,
+				 jack_nframes_t read_frames = 0,
+				 jack_nframes_t skip_frames = 0) const;
+
+	bool verify_start (jack_nframes_t position);
+	bool verify_length (jack_nframes_t position);
+	bool verify_start_mutable (jack_nframes_t& start);
+	bool verify_start_and_length (jack_nframes_t start, jack_nframes_t length);
+	void recompute_at_start ();
+	void recompute_at_end ();
+
+	void envelope_changed (Change);
+
+	void source_deleted (Source*);
+};
+
+} /* namespace ARDOUR */
+
+/* access from C objects */
+
+extern "C" {
+	int    region_read_peaks_from_c   (void *arg, uint32_t npeaks, uint32_t start, uint32_t length, intptr_t data, uint32_t n_chan, double samples_per_unit);
+	uint32_t region_length_from_c (void *arg);
+	uint32_t sourcefile_length_from_c (void *arg);
+}
+
+#endif /* __ardour_audio_region_h__ */