diff --git a/include/audacity/Types.h b/include/audacity/Types.h
index be6694fb2..3a814f6ab 100644
--- a/include/audacity/Types.h
+++ b/include/audacity/Types.h
@@ -58,135 +58,6 @@
 //        until proper public headers are created for the stuff in here.
 // ----------------------------------------------------------------------------
 
-// ----------------------------------------------------------------------------
-// A native 64-bit integer...used when referring to any number of samples
-// ----------------------------------------------------------------------------
-
-class sampleCount
-{
-public:
-   using type = long long;
-   static_assert(sizeof(type) == 8, "Wrong width of sampleCount");
-
-   sampleCount () : value { 0 } {}
-
-   // Allow implicit conversion from integral types
-   sampleCount ( type v ) : value { v } {}
-   sampleCount ( unsigned long long v ) : value ( v ) {}
-   sampleCount ( int v ) : value { v } {}
-   sampleCount ( unsigned v ) : value { v } {}
-   sampleCount ( long v ) : value { v } {}
-
-   // unsigned long is 64 bit on some platforms.  Let it narrow.
-   sampleCount ( unsigned long v ) : value ( v ) {}
-
-   // Beware implicit conversions from floating point values!
-   // Otherwise the meaning of binary operators with sampleCount change
-   // their meaning when sampleCount is not an alias!
-   explicit sampleCount ( float f ) : value ( f ) {}
-   explicit sampleCount ( double d ) : value ( d ) {}
-
-   sampleCount ( const sampleCount& ) = default;
-   sampleCount &operator= ( const sampleCount& ) = default;
-
-   float as_float() const { return value; }
-   double as_double() const { return value; }
-
-   long long as_long_long() const { return value; }
-
-   size_t as_size_t() const {
-      wxASSERT(value >= 0);
-      wxASSERT(static_cast<std::make_unsigned<type>::type>(value) <= std::numeric_limits<size_t>::max());
-      return value;
-   }
-
-   sampleCount &operator += (sampleCount b) { value += b.value; return *this; }
-   sampleCount &operator -= (sampleCount b) { value -= b.value; return *this; }
-   sampleCount &operator *= (sampleCount b) { value *= b.value; return *this; }
-   sampleCount &operator /= (sampleCount b) { value /= b.value; return *this; }
-   sampleCount &operator %= (sampleCount b) { value %= b.value; return *this; }
-
-   sampleCount operator - () const { return -value; }
-
-   sampleCount &operator ++ () { ++value; return *this; }
-   sampleCount operator ++ (int)
-      { sampleCount result{ *this }; ++value; return result; }
-
-   sampleCount &operator -- () { --value; return *this; }
-   sampleCount operator -- (int)
-      { sampleCount result{ *this }; --value; return result; }
-
-private:
-   type value;
-};
-
-inline bool operator == (sampleCount a, sampleCount b)
-{
-   return a.as_long_long() == b.as_long_long();
-}
-
-inline bool operator != (sampleCount a, sampleCount b)
-{
-   return !(a == b);
-}
-
-inline bool operator < (sampleCount a, sampleCount b)
-{
-   return a.as_long_long() < b.as_long_long();
-}
-
-inline bool operator >= (sampleCount a, sampleCount b)
-{
-   return !(a < b);
-}
-
-inline bool operator > (sampleCount a, sampleCount b)
-{
-   return b < a;
-}
-
-inline bool operator <= (sampleCount a, sampleCount b)
-{
-   return !(b < a);
-}
-
-inline sampleCount operator + (sampleCount a, sampleCount b)
-{
-   return sampleCount{ a } += b;
-}
-
-inline sampleCount operator - (sampleCount a, sampleCount b)
-{
-   return sampleCount{ a } -= b;
-}
-
-inline sampleCount operator * (sampleCount a, sampleCount b)
-{
-   return sampleCount{ a } *= b;
-}
-
-inline sampleCount operator / (sampleCount a, sampleCount b)
-{
-   return sampleCount{ a } /= b;
-}
-
-inline sampleCount operator % (sampleCount a, sampleCount b)
-{
-   return sampleCount{ a } %= b;
-}
-
-// ----------------------------------------------------------------------------
-// Function returning the minimum of a sampleCount and a size_t,
-// hiding the casts
-// ----------------------------------------------------------------------------
-
-inline size_t limitSampleBufferSize( size_t bufferSize, sampleCount limit )
-{
-   return
-      std::min( sampleCount( bufferSize ), std::max( sampleCount(0), limit ) )
-         .as_size_t();
-}
-
 // ----------------------------------------------------------------------------
 // Supported sample formats
 // ----------------------------------------------------------------------------
diff --git a/src/AudioIO.h b/src/AudioIO.h
index a2108b31c..5f6d52c9a 100644
--- a/src/AudioIO.h
+++ b/src/AudioIO.h
@@ -40,6 +40,7 @@ using NoteTrackConstArray = std::vector < std::shared_ptr< const NoteTrack > >;
 
 #include <wx/event.h> // to declare custom event types
 
+#include "SampleCount.h"
 #include "SampleFormat.h"
 
 class wxArrayString;
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 9877f076f..f43d2dfb9 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -246,6 +246,8 @@ list( APPEND SOURCES
       RingBuffer.h
       SampleBlock.cpp
       SampleBlock.h
+      SampleCount.cpp
+      SampleCount.h
       SampleFormat.cpp
       SampleFormat.h
       Screenshot.cpp
diff --git a/src/Mix.h b/src/Mix.h
index 2d678da8e..0cc58a115 100644
--- a/src/Mix.h
+++ b/src/Mix.h
@@ -23,6 +23,7 @@
 #include "SampleFormat.h"
 #include <vector>
 
+class sampleCount;
 class Resample;
 class BoundedEnvelope;
 class WaveTrackFactory;
diff --git a/src/SampleCount.cpp b/src/SampleCount.cpp
new file mode 100644
index 000000000..f0258ba91
--- /dev/null
+++ b/src/SampleCount.cpp
@@ -0,0 +1,26 @@
+/**********************************************************************
+
+  Audacity: A Digital Audio Editor
+
+  @file SampleCount.cpp
+
+  Paul Licameli split from audacity/Types.h
+
+**********************************************************************/
+#include "SampleCount.h"
+
+#include <algorithm>
+#include <wx/debug.h>
+
+size_t sampleCount::as_size_t() const {
+   wxASSERT(value >= 0);
+   wxASSERT(static_cast<std::make_unsigned<type>::type>(value) <= std::numeric_limits<size_t>::max());
+   return value;
+}
+
+size_t limitSampleBufferSize( size_t bufferSize, sampleCount limit )
+{
+   return
+      std::min( sampleCount( bufferSize ), std::max( sampleCount(0), limit ) )
+         .as_size_t();
+}
diff --git a/src/SampleCount.h b/src/SampleCount.h
index be6694fb2..8b8cebfbf 100644
--- a/src/SampleCount.h
+++ b/src/SampleCount.h
@@ -1,68 +1,20 @@
 /**********************************************************************
 
-   Audacity: A Digital Audio Editor
+  Audacity: A Digital Audio Editor
 
-   Types.h
+  @file SampleCount.h
 
-   Leland Lucius
+  Paul Licameli split from audacity/Types.h
 
-   Copyright (c) 2014, Audacity Team 
-   All rights reserved.
-
-   Redistribution and use in source and binary forms, with or without
-   modification, are permitted provided that the following conditions
-   are met:
-
-   1. Redistributions of source code must retain the above copyright
-   notice, this list of conditions and the following disclaimer.
-
-   2. Redistributions in binary form must reproduce the above copyright
-   notice, this list of conditions and the following disclaimer in the
-   documentation and/or other materials provided with the distribution.
-
-   3. Neither the name of the copyright holder nor the names of its
-   contributors may be used to endorse or promote products derived from
-   this software without specific prior written permission.
-
-   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-   CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-   ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-   POSSIBILITY OF SUCH DAMAGE.
-   
 **********************************************************************/
+#ifndef __AUDACITY_SAMPLE_COUNT__
+#define __AUDACITY_SAMPLE_COUNT__
 
-#ifndef __AUDACITY_TYPES_H__
-#define __AUDACITY_TYPES_H__
+#include <cstddef>
 
-#include <algorithm>
-#include <functional>
-#include <limits>
-#include <type_traits>
-#include <vector>
-#include <wx/debug.h> // for wxASSERT
-#include <wx/string.h> // type used in inline function and member variable
-
-#include "Internat.h"
-
-// ----------------------------------------------------------------------------
-// TODO:  I'd imagine this header may be replaced by other public headers. But,
-//        to try and minimize more changes to the base code, we can use this
-//        until proper public headers are created for the stuff in here.
-// ----------------------------------------------------------------------------
-
-// ----------------------------------------------------------------------------
-// A native 64-bit integer...used when referring to any number of samples
-// ----------------------------------------------------------------------------
-
-class sampleCount
+//! Positions or offsets within audio files need a wide type
+/*! This type disallows implicit interconversions with narrower types */
+class AUDACITY_DLL_API sampleCount
 {
 public:
    using type = long long;
@@ -94,11 +46,7 @@ public:
 
    long long as_long_long() const { return value; }
 
-   size_t as_size_t() const {
-      wxASSERT(value >= 0);
-      wxASSERT(static_cast<std::make_unsigned<type>::type>(value) <= std::numeric_limits<size_t>::max());
-      return value;
-   }
+   size_t as_size_t() const;
 
    sampleCount &operator += (sampleCount b) { value += b.value; return *this; }
    sampleCount &operator -= (sampleCount b) { value -= b.value; return *this; }
@@ -180,43 +128,7 @@ inline sampleCount operator % (sampleCount a, sampleCount b)
 // hiding the casts
 // ----------------------------------------------------------------------------
 
-inline size_t limitSampleBufferSize( size_t bufferSize, sampleCount limit )
-{
-   return
-      std::min( sampleCount( bufferSize ), std::max( sampleCount(0), limit ) )
-         .as_size_t();
-}
+AUDACITY_DLL_API
+size_t limitSampleBufferSize( size_t bufferSize, sampleCount limit );
 
-// ----------------------------------------------------------------------------
-// Supported sample formats
-// ----------------------------------------------------------------------------
-enum sampleFormat : unsigned
-{
-   //! The increasing sequence of these enum values must correspond to the increasing data type width
-   //! These values persist in saved project files, so must not be changed in later program versions
-   int16Sample = 0x00020001,
-   int24Sample = 0x00040001,
-   floatSample = 0x0004000F,
-
-   //! Two synonyms for previous values that might change if more values were added
-   narrowestSampleFormat = int16Sample,
-   widestSampleFormat = floatSample,
-};
-
-// ----------------------------------------------------------------------------
-// Provide the number of bytes a specific sample will take
-// ----------------------------------------------------------------------------
-#define SAMPLE_SIZE(SampleFormat) (SampleFormat >> 16)
-
-// ----------------------------------------------------------------------------
-// Generic pointer to sample data
-// ----------------------------------------------------------------------------
-typedef char *samplePtr;
-typedef const char *constSamplePtr;
-
-// ----------------------------------------------------------------------------
-// The type for plugin IDs
-// ----------------------------------------------------------------------------
-typedef wxString PluginID;
-
-#endif // __AUDACITY_TYPES_H__
+#endif
diff --git a/src/Sequence.h b/src/Sequence.h
index 4b5c791f4..e5f2ba56d 100644
--- a/src/Sequence.h
+++ b/src/Sequence.h
@@ -18,7 +18,7 @@
 #include "SampleFormat.h"
 #include "xml/XMLTagHandler.h"
 
-#include "Identifier.h"
+#include "SampleCount.h"
 
 class SampleBlock;
 class SampleBlockFactory;
diff --git a/src/VoiceKey.h b/src/VoiceKey.h
index 52e7f41c2..409e8266a 100644
--- a/src/VoiceKey.h
+++ b/src/VoiceKey.h
@@ -16,7 +16,7 @@
 #define	M_PI		3.14159265358979323846  /* pi */
 #endif
 
-#include "audacity/Types.h"
+#include "SampleCount.h"
 
 class WaveTrack;
 
diff --git a/src/WaveClip.h b/src/WaveClip.h
index ca109aa62..fe5407374 100644
--- a/src/WaveClip.h
+++ b/src/WaveClip.h
@@ -25,6 +25,7 @@
 class BlockArray;
 class Envelope;
 class ProgressDialog;
+class sampleCount;
 class SampleBlock;
 class SampleBlockFactory;
 using SampleBlockFactoryPtr = std::shared_ptr<SampleBlockFactory>;
diff --git a/src/WaveTrack.h b/src/WaveTrack.h
index a8324453d..67eb7ef15 100644
--- a/src/WaveTrack.h
+++ b/src/WaveTrack.h
@@ -12,6 +12,7 @@
 #define __AUDACITY_WAVETRACK__
 
 #include "Track.h"
+#include "SampleCount.h"
 
 #include <vector>
 #include <functional>
diff --git a/src/effects/EBUR128.cpp b/src/effects/EBUR128.cpp
index 7978380c8..dd7e94b12 100644
--- a/src/effects/EBUR128.cpp
+++ b/src/effects/EBUR128.cpp
@@ -9,6 +9,7 @@ Max Maisel
 ***********************************************************************/
 
 #include "EBUR128.h"
+#include <cstring>
 
 EBUR128::EBUR128(double rate, size_t channels)
    : mChannelCount(channels)
diff --git a/src/effects/Effect.h b/src/effects/Effect.h
index f368f7330..10777b656 100644
--- a/src/effects/Effect.h
+++ b/src/effects/Effect.h
@@ -28,6 +28,7 @@ class wxWindow;
 #include "ConfigInterface.h"
 #include "EffectInterface.h"
 
+#include "../SampleCount.h"
 #include "../SelectedRegion.h"
 
 #include "../Track.h"
diff --git a/src/effects/VST/VSTEffect.cpp b/src/effects/VST/VSTEffect.cpp
index 1f90145a8..e427def28 100644
--- a/src/effects/VST/VSTEffect.cpp
+++ b/src/effects/VST/VSTEffect.cpp
@@ -27,6 +27,7 @@
 
 #include "VSTEffect.h"
 #include "../../ModuleManager.h"
+#include "../../SampleCount.h"
 
 #include "../../widgets/ProgressDialog.h"
 
diff --git a/src/effects/audiounits/AudioUnitEffect.cpp b/src/effects/audiounits/AudioUnitEffect.cpp
index e3053239c..5c1f30c51 100644
--- a/src/effects/audiounits/AudioUnitEffect.cpp
+++ b/src/effects/audiounits/AudioUnitEffect.cpp
@@ -19,6 +19,7 @@
 #if USE_AUDIO_UNITS
 #include "AudioUnitEffect.h"
 #include "../../ModuleManager.h"
+#include "../../SampleCount.h"
 
 #include <wx/defs.h>
 #include <wx/base64.h>
diff --git a/src/effects/ladspa/LadspaEffect.cpp b/src/effects/ladspa/LadspaEffect.cpp
index 363aa1a39..f7c5798f3 100644
--- a/src/effects/ladspa/LadspaEffect.cpp
+++ b/src/effects/ladspa/LadspaEffect.cpp
@@ -24,6 +24,7 @@ effects from this one class.
 
 
 #include "LadspaEffect.h"       // This class's header file
+#include "SampleCount.h"
 
 #include <float.h>
 
diff --git a/src/effects/lv2/LV2Effect.cpp b/src/effects/lv2/LV2Effect.cpp
index da2909bc4..424223f47 100755
--- a/src/effects/lv2/LV2Effect.cpp
+++ b/src/effects/lv2/LV2Effect.cpp
@@ -22,6 +22,7 @@
 #endif
 
 #include "LV2Effect.h"
+#include "SampleCount.h"
 
 #include <cmath>
 
diff --git a/src/toolbars/TranscriptionToolBar.h b/src/toolbars/TranscriptionToolBar.h
index 6d10226df..ef0779fb0 100644
--- a/src/toolbars/TranscriptionToolBar.h
+++ b/src/toolbars/TranscriptionToolBar.h
@@ -17,8 +17,6 @@
 
 #include <wx/brush.h> // member variable
 
-#include "audacity/Types.h"
-
 class wxChoice;
 class wxCommandEvent;
 class wxImage;
@@ -28,6 +26,7 @@ class AButton;
 class ASlider;
 class AudacityProject;
 class BoundedEnvelope;
+class sampleCount;
 class WaveTrack;
 
 #ifdef EXPERIMENTAL_VOICE_DETECTION
diff --git a/src/tracks/playabletrack/wavetrack/ui/SampleHandle.h b/src/tracks/playabletrack/wavetrack/ui/SampleHandle.h
index 875082883..004e0f272 100644
--- a/src/tracks/playabletrack/wavetrack/ui/SampleHandle.h
+++ b/src/tracks/playabletrack/wavetrack/ui/SampleHandle.h
@@ -12,7 +12,7 @@ Paul Licameli
 #define __AUDACITY_SAMPLE_HANDLE__
 
 #include "../../../../UIHandle.h"
-#include "audacity/Types.h"
+#include "../../../../SampleCount.h"
 
 class wxMouseEvent;
 class wxMouseState;
diff --git a/src/tracks/playabletrack/wavetrack/ui/WaveTrackView.h b/src/tracks/playabletrack/wavetrack/ui/WaveTrackView.h
index b880e85e3..144e1de23 100644
--- a/src/tracks/playabletrack/wavetrack/ui/WaveTrackView.h
+++ b/src/tracks/playabletrack/wavetrack/ui/WaveTrackView.h
@@ -13,8 +13,8 @@ Paul Licameli split from class WaveTrack
 
 #include "../../../ui/CommonTrackView.h"
 #include "../../../../ClientData.h"
+#include "../../../../SampleCount.h"
 namespace WaveTrackViewConstants{ enum Display : int; }
-#include "audacity/Types.h"
 struct WaveTrackSubViewType;
 
 class CutlineHandle;
diff --git a/src/widgets/NumericTextCtrl.cpp b/src/widgets/NumericTextCtrl.cpp
index 4c8937a0b..edbe85d3b 100644
--- a/src/widgets/NumericTextCtrl.cpp
+++ b/src/widgets/NumericTextCtrl.cpp
@@ -168,7 +168,7 @@ different formats.
 
 #include "NumericTextCtrl.h"
 
-#include "audacity/Types.h"
+#include "../SampleCount.h"
 #include "../AllThemeResources.h"
 #include "../AColor.h"
 #include "../KeyboardCapture.h"