diff --git a/src/AboutDialog.cpp b/src/AboutDialog.cpp
index e21eaf77f..17f7031eb 100644
--- a/src/AboutDialog.cpp
+++ b/src/AboutDialog.cpp
@@ -355,6 +355,7 @@ visit our [[http://forum.audacityteam.org/|forum]].");
 
    wxString creditStr = FormatHtmlText(
       wxString( wxT("<center>") ) +
+// DA: Description and provenance in About box
 #ifdef EXPERIMENTAL_DA
       #undef _
       #define _(s) wxGetTranslation((s))
@@ -370,8 +371,11 @@ visit our [[http://forum.audacityteam.org/|forum]].");
       //wxT("<p>") + par2Str +
       wxT("<h3>") + _("Credits") + wxT("</h3>") + wxT("<p>") +
 
+// DA: Customisation credit
+#ifdef EXPERIMENTAL_DA
       wxT("<p><b>") + wxString::Format(_("DarkAudacity Customisation")) + wxT("</b><br>") +
       wxT("James Crook, art, coding &amp; design<br>") +
+#endif
 
       wxT("<p><b>") + wxString::Format(_("Audacity Team Members")) + wxT("</b><br>") +
       GetCreditsByRole(roleTeamMember) +
@@ -395,6 +399,8 @@ visit our [[http://forum.audacityteam.org/|forum]].");
       GetCreditsByRole(roleThanks) +
 
       wxT("<p><br>Audacity website: [[http://www.audacityteam.org/|http://www.audacityteam.org/]]") +
+
+// DA: Link for DA url too
 #ifdef EXPERIMENTAL_DA
       wxT("<br>DarkAudacity website: [[http://www.darkaudacity.com/|http://www.darkaudacity.com/]]") +
 #endif
diff --git a/src/AudacityApp.cpp b/src/AudacityApp.cpp
index b133289f0..dd3c13d02 100644
--- a/src/AudacityApp.cpp
+++ b/src/AudacityApp.cpp
@@ -1275,6 +1275,8 @@ bool AudacityApp::OnInit()
 
    // Don't use AUDACITY_NAME here.
    // We want Audacity with a capital 'A'
+
+// DA: App name
 #ifndef EXPERIMENTAL_DA
    wxString appName = wxT("Audacity");
 #else
@@ -1309,6 +1311,8 @@ bool AudacityApp::OnInit()
 
    /* On Unix systems, the default temp dir is in /var/tmp. */
    defaultTempDir.Printf(wxT("/var/tmp/audacity-%s"), wxGetUserId().c_str());
+
+// DA: Path env variable.
 #ifndef EXPERIMENTAL_DA
    wxString pathVar = wxGetenv(wxT("AUDACITY_PATH"));
 #else
diff --git a/src/Experimental.h b/src/Experimental.h
index 90612b777..1343afaef 100644
--- a/src/Experimental.h
+++ b/src/Experimental.h
@@ -48,7 +48,7 @@
 // feature to link audio tracks to a label track
 #define EXPERIMENTAL_SYNC_LOCK
 
-// enables dark audacity theme and customisations.
+// DA: Enables dark audacity theme and customisations.
 #define EXPERIMENTAL_DA
 
 // experimental theming
diff --git a/src/FileNames.cpp b/src/FileNames.cpp
index 73311c223..60dfb9cc7 100644
--- a/src/FileNames.cpp
+++ b/src/FileNames.cpp
@@ -252,6 +252,7 @@ wxString FileNames::ThemeImageDefsAsCee()
 
 wxString FileNames::ThemeCacheAsCee( )
 {
+// DA: Theme sourcery file name.
 #ifndef EXPERIMENTAL_DA
    return wxFileName( ThemeDir(), wxT("ThemeAsCeeCode.h") ).GetFullPath();
 #else
diff --git a/src/HelpText.cpp b/src/HelpText.cpp
index 301540374..15e52f5bf 100644
--- a/src/HelpText.cpp
+++ b/src/HelpText.cpp
@@ -210,7 +210,9 @@ static wxString HelpTextBuiltIn( const wxString & Key )
          _("<br><br>The version of Audacity you are using is an <b>Alpha test version</b>.") + " " +
          _("We strongly recommend that you use our latest stable released version, which has full documentation and support.<br><br>")+
          _("You can help us get Audacity ready for release by joining our [[http://www.audacityteam.org/community/|community]].<hr><br><br>")+
-#endif         
+#endif   
+
+// DA: Support methods text.
 #ifdef EXPERIMENTAL_DA
          wxT("<center><h3>DarkAudacity ") + AUDACITY_VERSION_STRING + wxT("</h3></center>") +
          _("<br><br>DarkAudacity is based on Audacity:") + wxT("<ul><li>") +
@@ -259,6 +261,7 @@ audio CDs]].") + wxT("</p>")
    if(Key ==  wxT("remotehelp") )
    {
 // *URL* will be replaced by whatever URL we are looking for.
+// DA: View the manual on line is expected.
 #ifdef EXPERIMENTAL_DA
       return WrapText(_("The Manual does not appear to be installed. \
 Please [[*URL*|view the Manual online]].<br><br>\
diff --git a/src/Internat.cpp b/src/Internat.cpp
index eb216fcb3..fc4c0500f 100644
--- a/src/Internat.cpp
+++ b/src/Internat.cpp
@@ -40,6 +40,7 @@ wxChar Internat::mDecimalSeparator = wxT('.'); // default
 wxArrayString Internat::exclude;
 wxCharBuffer Internat::mFilename;
 
+// DA: Use tweaked translation mechanism to replace 'Audacity' by 'DarkAudacity'.
 #ifdef EXPERIMENTAL_DA
 // This function allows us to replace Audacity by DarkAudacity without peppering 
 // the source code with changes.  We split out this step, the customisation, as 
diff --git a/src/Menus.cpp b/src/Menus.cpp
index 54410d667..1f77aa9e1 100644
--- a/src/Menus.cpp
+++ b/src/Menus.cpp
@@ -325,7 +325,7 @@ void AudacityProject::CreateMenusAndCommands()
          AudioIONotBusyFlag | UnsavedChangesFlag);
       c->AddItem(wxT("SaveAs"), _("Save Project &As..."), FN(OnSaveAs));
       c->BeginSubMenu( _("Save Other") );
-//#ifdef EXPERIMENTAL_DA
+
       // Enable Export audio commands only when there are audio tracks.
       c->AddItem(wxT("ExportMp3"), _("Export as MP&3"), FN(OnExportMp3), wxT(""),
          AudioIONotBusyFlag | WaveTracksExistFlag,
@@ -338,7 +338,6 @@ void AudacityProject::CreateMenusAndCommands()
       c->AddItem(wxT("ExportOgg"), _("Export as &OGG"), FN(OnExportOgg), wxT(""),
          AudioIONotBusyFlag | WaveTracksExistFlag,
          AudioIONotBusyFlag | WaveTracksExistFlag);
-//#endif
 
       c->AddItem(wxT("Export"), _("&Export Audio..."), FN(OnExportAudio), wxT("Ctrl+Shift+E"),
          AudioIONotBusyFlag | WaveTracksExistFlag,
@@ -598,6 +597,7 @@ void AudacityProject::CreateMenusAndCommands()
          TracksExistFlag, TracksExistFlag);
 
 #ifdef EXPERIMENTAL_SYNC_LOCK
+// DA: Time-Locked vs Sync-Locked
 #ifdef EXPERIMENTAL_DA
       c->AddItem(wxT("SelSyncLockTracks"), _("In All Time-Locked Tracks"),
 #else
@@ -612,13 +612,11 @@ void AudacityProject::CreateMenusAndCommands()
       c->AddItem(wxT("ZeroCross"), _("Ends to &Zero Crossings"), FN(OnZeroCrossing), wxT("Z"));
       c->AddSeparator();
 
-#ifndef EXPERIMENTAL_DA
       c->AddItem(wxT("StoreCursorPosition"), _("Save Cursor Pos&ition"), FN(OnCursorPositionStore),
          WaveTracksExistFlag,
          WaveTracksExistFlag);
       // Save cursor position is used in some selctions.
       // Maybe there should be a restore for it?
-#endif
 
       // Audacity has 'Store Re&gion' here.
       c->AddItem(wxT("SelSave"), _("Save Sele&ction"), FN(OnSelectionSave),
@@ -815,8 +813,7 @@ void AudacityProject::CreateMenusAndCommands()
       // Scrubbing sub-menu
       GetScrubber().AddMenuItems();
 
-#ifndef EXPERIMENTAL_DA
-      // JKC: ANSWER-ME: How is this different to 'Skip To' and how is it useful?
+      // JKC: ANSWER-ME: How is 'cursor to' different to 'Skip To' and how is it useful?
       c->BeginSubMenu(_("Cursor to"));
 
       c->AddItem(wxT("CursSelStart"), _("Selection Star&t"), FN(OnCursorSelStart));
@@ -829,7 +826,6 @@ void AudacityProject::CreateMenusAndCommands()
       c->AddItem(wxT("CursProjectEnd"), _("Project E&nd"), FN(OnSkipEnd), wxT("End"));
 
       c->EndSubMenu();
-#endif
 
       c->AddSeparator();
 
@@ -982,6 +978,7 @@ void AudacityProject::CreateMenusAndCommands()
       c->AddSeparator();
 
 #ifdef EXPERIMENTAL_SYNC_LOCK
+// DA: Time-Lock vs Sync-Lock
 #ifdef EXPERIMENTAL_DA
       c->AddCheck(wxT("SyncLock"), _("Time-&Lock Tracks (on/off)"), FN(OnSyncLock), 0,
 #else
@@ -1128,15 +1125,16 @@ void AudacityProject::CreateMenusAndCommands()
       c->BeginMenu(_("&Help"));
       c->SetDefaultFlags(AlwaysEnabledFlag, AlwaysEnabledFlag);
 
-#ifndef EXPERIMENTAL_DA
-      c->AddItem(wxT("QuickHelp"), _("&Quick Help"), FN(OnQuickHelp));
-      c->AddItem(wxT("Manual"), _("&Manual"), FN(OnManual));
-#else
+// DA: Emphasise it is the Audacity Manual (No separate DA manual).
+#ifdef EXPERIMENTAL_DA
       // 'Getting Started' rather than 'Quick Help' for DarkAudacity.
       // At the moment the video tutorials are aspirational (aka do not exist yet).
       // Emphasise that manual is for Audacity, not DarkAudacity.
       c->AddItem(wxT("QuickHelp"), _("&Getting Started"), FN(OnQuickHelp));
       c->AddItem(wxT("Manual"), wxT("Audacity &Manual"), FN(OnManual));
+#else
+      c->AddItem(wxT("QuickHelp"), _("&Quick Help"), FN(OnQuickHelp));
+      c->AddItem(wxT("Manual"), _("&Manual"), FN(OnManual));
 #endif
 
 
@@ -1171,6 +1169,7 @@ void AudacityProject::CreateMenusAndCommands()
       c->AddSeparator();
 #endif
 
+// DA: Does not fully support update checking.
 #ifndef EXPERIMENTAL_DA
       c->AddItem(wxT("Updates"), _("&Check for Updates..."), FN(OnCheckForUpdates));
 #endif
diff --git a/src/Project.cpp b/src/Project.cpp
index 1290455bb..ed1fc5f27 100644
--- a/src/Project.cpp
+++ b/src/Project.cpp
@@ -1276,7 +1276,7 @@ void AudacityProject::UpdatePrefsVariables()
    gPrefs->Read(wxT("/AudioFiles/NormalizeOnLoad"),&mNormalizeOnLoad, false);
    gPrefs->Read(wxT("/GUI/AutoScroll"), &mViewInfo.bUpdateTrackIndicator, true);
    gPrefs->Read(wxT("/GUI/EmptyCanBeDirty"), &mEmptyCanBeDirty, true );
-// DA 2.1.3x did not ship with a manual, so default for DA is internet.
+// DA: Default for DA is manual from internet.
 #ifdef EXPERIMENTAL_DA
    gPrefs->Read(wxT("/GUI/Help"), &mHelpPref, wxT("FromInternet") );
 #else
diff --git a/src/Theme.cpp b/src/Theme.cpp
index 476426822..e585a9095 100644
--- a/src/Theme.cpp
+++ b/src/Theme.cpp
@@ -189,6 +189,7 @@ WX_DEFINE_USER_EXPORTED_OBJARRAY( ArrayOfColours )
 #include "AllThemeResources.h"
 
 // Include the ImageCache...
+// DA: Default theme is dark 
 #ifdef EXPERIMENTAL_DA
 static unsigned char ImageCacheAsData[] = {
 #include "DarkThemeAsCeeCode.h"
@@ -524,6 +525,7 @@ int SourceOutputStream::OpenFile(const wxString & Filename)
    bOk = File.Open( Filename, wxFile::write );
    if( bOk )
    {
+// DA: Naming of output sourcery
 #ifdef EXPERIMENTAL_DA
       File.Write( wxT("//   DarkThemeAsCeeCode.h\r\n") );
 #else
@@ -843,16 +845,17 @@ bool ThemeBase::ReadImageCache( teThemeType type, bool bOkIfNotFound)
    // ELSE we are reading from internal storage.
    else
    {
-#ifndef EXPERIMENTAL_DA
-      wxMemoryInputStream InternalStream(
-         (char *)ImageCacheAsData, sizeof(ImageCacheAsData));
-#else
+// DA: Has more built-in theme sources.
+#ifdef EXPERIMENTAL_DA
       wxMemoryInputStream DarkInternalStream(
          (char *)ImageCacheAsData, sizeof(ImageCacheAsData));
       wxMemoryInputStream LightInternalStream(
          (char *)LightImageCacheAsData, sizeof(LightImageCacheAsData));
       wxMemoryInputStream & InternalStream = (type == themeDark) ?
          DarkInternalStream : LightInternalStream;
+#else
+      wxMemoryInputStream InternalStream(
+         (char *)ImageCacheAsData, sizeof(ImageCacheAsData));
 #endif
       if( !ImageCache.LoadFile( InternalStream, wxBITMAP_TYPE_PNG ))
       {
diff --git a/src/TrackPanel.cpp b/src/TrackPanel.cpp
index a8ea25236..f5e090e42 100644
--- a/src/TrackPanel.cpp
+++ b/src/TrackPanel.cpp
@@ -9072,6 +9072,7 @@ void TrackInfo::GetMuteSoloRect(const wxRect & rect, wxRect & dest, bool solo, b
 
 
    dest.height = kTrackInfoBtnSize;
+// DA: Mute solo buttons wider and higher.
 #ifdef EXPERIMENTAL_DA
    dest.width = 100 - 2 * kTrackInfoBtnSize;
    dest.x = rect.x + (100 - dest.width)*0.5 ;
@@ -9356,6 +9357,7 @@ void TrackInfo::DrawMuteSolo(wxDC * dc, const wxRect & rect, Track * t,
       /* i18n-hint: This is on a button that will silence all the other tracks.*/
       _("Mute");
 
+// DA: Uses Theme to draw buttons.
 #ifdef EXPERIMENTAL_DA
    AColor::Bevel2(
 #else   
diff --git a/src/TrackPanelAx.cpp b/src/TrackPanelAx.cpp
index b44120568..bd1bc85f6 100644
--- a/src/TrackPanelAx.cpp
+++ b/src/TrackPanelAx.cpp
@@ -395,6 +395,7 @@ wxAccStatus TrackPanelAx::GetName( int childId, wxString* name )
                   this track is shown with a sync-locked icon.*/
                // The absence of a dash between Sync and Locked is deliberate -
                // if present, Jaws reads it as "dash".
+// DA: Time Lock vs Sync Lock.
 #ifdef EXPERIMENTAL_DA
                name->Append( wxT(" ") + wxString(_( " Time Lock Selected" )) );
 #else
diff --git a/src/ViewInfo.cpp b/src/ViewInfo.cpp
index 30107b4e5..c27543886 100644
--- a/src/ViewInfo.cpp
+++ b/src/ViewInfo.cpp
@@ -90,6 +90,7 @@ bool ZoomInfo::ZoomOutAvailable() const
 void ZoomInfo::SetZoom(double pixelsPerSecond)
 {
    zoom = std::max(gMinZoom, std::min(gMaxZoom, pixelsPerSecond));
+// DA: Avoids stuck in snap-to
 #ifdef EXPERIMENTAL_DA
    // Disable snapping if user zooms in a long way.
    // Helps stop users be trapped in snap-to.
diff --git a/src/effects/DtmfGen.cpp b/src/effects/DtmfGen.cpp
index 8fa2c7da6..7f089cbfc 100644
--- a/src/effects/DtmfGen.cpp
+++ b/src/effects/DtmfGen.cpp
@@ -34,6 +34,7 @@ enum
    ID_DutyCycle,
 };
 
+// DA: DTMF for Audacity uses a different string.
 #ifdef EXPERIMENTAL_DA
 #define SHORT_APP_NAME "darkaudacity"
 #else
diff --git a/src/effects/TruncSilence.cpp b/src/effects/TruncSilence.cpp
index fbd51d1cd..8fb70e5e7 100644
--- a/src/effects/TruncSilence.cpp
+++ b/src/effects/TruncSilence.cpp
@@ -284,6 +284,8 @@ bool EffectTruncSilence::ProcessIndependently()
                if (track2->GetKind() == Track::Wave &&
                   !(track2 == track || track2 == link) &&
                   track2->GetSelected()) {
+
+// DA: Time-Locked vs Sync-Locked
 #ifdef EXPERIMENTAL_DA
                   ::wxMessageBox(_("When truncating independently, there may only be one selected audio track in each Time-Locked Track Group."));
 #else
diff --git a/src/prefs/GUIPrefs.cpp b/src/prefs/GUIPrefs.cpp
index 09bc33d56..4332cbd5f 100644
--- a/src/prefs/GUIPrefs.cpp
+++ b/src/prefs/GUIPrefs.cpp
@@ -192,6 +192,7 @@ bool GUIPrefs::Apply()
       gPrefs->Flush();
    }
 
+// DA: Default themes differ.
 #ifdef EXPERIMENTAL_DA
    wxString theme = gPrefs->Read(wxT("/GUI/Theme"), wxT("dark"));
 #else
diff --git a/src/toolbars/EditToolBar.cpp b/src/toolbars/EditToolBar.cpp
index fa1ad1802..965fff4f8 100644
--- a/src/toolbars/EditToolBar.cpp
+++ b/src/toolbars/EditToolBar.cpp
@@ -148,6 +148,7 @@ void EditToolBar::Populate()
    AddSeparator();
 
 #ifdef EXPERIMENTAL_SYNC_LOCK
+// DA: Time-Locked vs Sync-Locked
 #ifndef EXPERIMENTAL_DA
    AddButton(bmpSyncLockTracksUp, bmpSyncLockTracksDown, bmpSyncLockTracksUp, ETBSyncLockID,
                _("Sync-Lock Tracks"), true);
@@ -214,6 +215,7 @@ void EditToolBar::RegenerateTooltips()
       { ETBRedoID,     wxT("Redo"),        XO("Redo")  },
 
 #ifdef EXPERIMENTAL_SYNC_LOCK
+// DA: No Sync Lock edit button
 #ifndef EXPERIMENTAL_DA
       { ETBSyncLockID, wxT("SyncLock"),    XO("Sync-Lock Tracks")  },
 #endif
diff --git a/src/toolbars/EditToolBar.h b/src/toolbars/EditToolBar.h
index a556471f9..2836dde02 100644
--- a/src/toolbars/EditToolBar.h
+++ b/src/toolbars/EditToolBar.h
@@ -38,6 +38,7 @@ enum {
    ETBRedoID,
 
 #ifdef EXPERIMENTAL_SYNC_LOCK
+// DA: No Sync Lock edit button
 #ifndef EXPERIMENTAL_DA
    ETBSyncLockID,
 #endif
diff --git a/src/widgets/HelpSystem.cpp b/src/widgets/HelpSystem.cpp
index 2c2626abc..e68cee6de 100644
--- a/src/widgets/HelpSystem.cpp
+++ b/src/widgets/HelpSystem.cpp
@@ -302,6 +302,7 @@ void HelpSystem::ShowHelpDialog(wxWindow *parent,
    }
    else if (releasePageName == wxT("Quick_Help"))
    {
+// DA: No bundled help, by default, and different quick-help URL.
 #ifdef EXPERIMENTAL_DA
       releasePageName = wxT("video") + HelpSystem::ReleaseSuffix + anchor;
       localHelpPage = wxFileName(FileNames::HtmlHelpDir(), releasePageName).GetFullPath();