diff --git a/src/Menus.cpp b/src/Menus.cpp
index a1f28b552..970602c62 100644
--- a/src/Menus.cpp
+++ b/src/Menus.cpp
@@ -7088,8 +7088,9 @@ void AudacityProject::OnMuteAllTracks()
 
    while (t)
    {
-      if (t->GetKind() == Track::Wave)
-         t->SetMute(true);
+      auto pt = dynamic_cast<PlayableTrack *>(t);
+      if (pt)
+         pt->SetMute(true);
 
       t = iter.Next();
    }
@@ -7107,7 +7108,9 @@ void AudacityProject::OnUnMuteAllTracks()
 
    while (t)
    {
-      t->SetMute(false);
+      auto pt = dynamic_cast<PlayableTrack *>(t);
+      if (pt)
+         pt->SetMute(false);
       t = iter.Next();
    }
 
diff --git a/src/MixerBoard.cpp b/src/MixerBoard.cpp
index 949402439..2b3ffef51 100644
--- a/src/MixerBoard.cpp
+++ b/src/MixerBoard.cpp
@@ -1110,9 +1110,11 @@ bool MixerBoard::HasSolo()
 {
    TrackListIterator iterTracks(mTracks);
    Track* pTrack;
-   for (pTrack = iterTracks.First(); pTrack; pTrack = iterTracks.Next())
-      if (pTrack->GetSolo())
+   for (pTrack = iterTracks.First(); pTrack; pTrack = iterTracks.Next()) {
+      auto pPlayable = dynamic_cast<PlayableTrack *>( pTrack );
+      if (pPlayable && pPlayable->GetSolo())
          return true;
+   }
    return false;
 }
 
diff --git a/src/Project.cpp b/src/Project.cpp
index 4cb842b53..0683c5f3c 100644
--- a/src/Project.cpp
+++ b/src/Project.cpp
@@ -3655,6 +3655,8 @@ void AudacityProject::WriteXML(XMLWriter &xmlFile, bool bWantSaveCompressed)
    while (t) {
       if ((t->GetKind() == Track::Wave) && bWantSaveCompressed)
       {
+         auto wt = static_cast<const WaveTrack *>(t);
+
          //vvv This should probably be a method, WaveTrack::WriteCompressedTrackXML().
          xmlFile.StartTag(wxT("import"));
          xmlFile.WriteAttr(wxT("filename"), mStrOtherNamesArray[ndx]); // Assumes mTracks order hasn't changed!
@@ -3665,8 +3667,8 @@ void AudacityProject::WriteXML(XMLWriter &xmlFile, bool bWantSaveCompressed)
          //    xmlFile.WriteAttr(wxT("linked"), t->GetLinked());
 
          xmlFile.WriteAttr(wxT("offset"), t->GetOffset(), 8);
-         xmlFile.WriteAttr(wxT("mute"), t->GetMute());
-         xmlFile.WriteAttr(wxT("solo"), t->GetSolo());
+         xmlFile.WriteAttr(wxT("mute"), wt->GetMute());
+         xmlFile.WriteAttr(wxT("solo"), wt->GetSolo());
          xmlFile.WriteAttr(wxT("height"), t->GetActualHeight());
          xmlFile.WriteAttr(wxT("minimized"), t->GetMinimized());
 
@@ -3975,10 +3977,12 @@ bool AudacityProject::Save(bool overwrite /* = true */ ,
               ((pTrack != NULL) && (pSavedTrack != NULL));
               pTrack = iter.Next(), pSavedTrack = savedTrackIter.Next())
          {
-            pWaveTrack = (WaveTrack*)pTrack;
+            pWaveTrack = static_cast<WaveTrack*>(pTrack);
+            auto pSavedWaveTrack = static_cast<const WaveTrack*>(pSavedTrack);
+
             pWaveTrack->SetSelected(pSavedTrack->GetSelected());
-            pWaveTrack->SetMute(pSavedTrack->GetMute());
-            pWaveTrack->SetSolo(pSavedTrack->GetSolo());
+            pWaveTrack->SetMute(pSavedWaveTrack->GetMute());
+            pWaveTrack->SetSolo(pSavedWaveTrack->GetSolo());
 
             pWaveTrack->SetGain(((WaveTrack*)pSavedTrack)->GetGain());
             pWaveTrack->SetPan(((WaveTrack*)pSavedTrack)->GetPan());
@@ -5430,36 +5434,45 @@ void AudacityProject::HandleTrackMute(Track *t, const bool exclusive)
    if (exclusive)
    {
       TrackListIterator iter(GetTracks());
-      Track *i = iter.First();
-      while (i) {
-         if (i == t) {
-            i->SetMute(true);
-            if(i->GetLinked()) { // also mute the linked track
-               i = iter.Next();
+      Track *it = iter.First();
+      while (it) {
+         auto i = dynamic_cast<PlayableTrack *>(it);
+         if (i) {
+            if (i == t) {
                i->SetMute(true);
+               if(i->GetLinked()) { // also mute the linked track
+                  it = iter.Next();
+                  i->SetMute(true);
+               }
             }
+            else {
+               i->SetMute(false);
+            }
+            i->SetSolo(false);
          }
-         else {
-            i->SetMute(false);
-         }
-         i->SetSolo(false);
-         i = iter.Next();
+         it = iter.Next();
       }
    }
    else
    {
       // Normal click toggles this track.
-      t->SetMute(!t->GetMute());
+      auto pt = dynamic_cast<PlayableTrack *>( t );
+      if (!pt)
+         return;
+
+      pt->SetMute(!pt->GetMute());
       if(t->GetLinked())   // set mute the same on both, if a pair
       {
-         bool muted = t->GetMute();
+         bool muted = pt->GetMute();
          TrackListIterator iter(GetTracks());
          Track *i = iter.First();
          while (i != t) {  // search for this track
             i = iter.Next();
          }
          i = iter.Next();  // get the next one, since linked
-         i->SetMute(muted);   // and mute it as well
+         auto pi = dynamic_cast<PlayableTrack *>( i );
+         if (pi)
+            pi->SetMute(muted);   // and mute it as well
       }
 
       if (IsSoloSimple() || IsSoloNone())
@@ -5471,18 +5484,23 @@ void AudacityProject::HandleTrackMute(Track *t, const bool exclusive)
          // We also set a solo indicator if we have just one track / stereo pair playing.
          // otherwise clear solo on everything.
          while (i) {
-            if( !i->GetMute())
-            {
-               nPlaying += 1;
-               if(i->GetLinked())
-                  i = iter.Next();  // don't count this one as it is linked
+            auto pi = dynamic_cast<PlayableTrack *>( i );
+            if (pi) {
+               if( !pi->GetMute())
+               {
+                  nPlaying += 1;
+                  if(i->GetLinked())
+                     i = iter.Next();  // don't count this one as it is linked
+               }
             }
             i = iter.Next();
          }
 
          i = iter.First();
          while (i) {
-            i->SetSolo( (nPlaying==1) && !i->GetMute() );   // will set both of a stereo pair
+            auto pi = dynamic_cast<PlayableTrack *>( i );
+            if (pi)
+               pi->SetSolo( (nPlaying==1) && !pi->GetMute() );   // will set both of a stereo pair
             i = iter.Next();
          }
       }
@@ -5492,8 +5510,12 @@ void AudacityProject::HandleTrackMute(Track *t, const bool exclusive)
 
 // Type of solo (standard or simple) follows the set preference, unless
 // alternate == true, which causes the opposite behavior.
-void AudacityProject::HandleTrackSolo(Track *t, const bool alternate)
+void AudacityProject::HandleTrackSolo(Track *const t, const bool alternate)
 {
+   const auto pt = dynamic_cast<PlayableTrack *>( t );
+   if (!pt)
+      return;
+
    bool bSoloMultiple = !IsSoloSimple() ^ alternate;
 
    // Standard and Simple solo have opposite defaults:
@@ -5503,17 +5525,19 @@ void AudacityProject::HandleTrackSolo(Track *t, const bool alternate)
    // when in standard radio button mode.
    if ( bSoloMultiple )
    {
-      t->SetSolo( !t->GetSolo() );
+      pt->SetSolo( !pt->GetSolo() );
       if(t->GetLinked())
       {
-         bool soloed = t->GetSolo();
+         bool soloed = pt->GetSolo();
          TrackListIterator iter(GetTracks());
          Track *i = iter.First();
          while (i != t) {  // search for this track
             i = iter.Next();
          }
          i = iter.Next();  // get the next one, since linked
-         i->SetSolo(soloed);   // and solo it as well
+         auto pi = dynamic_cast<PlayableTrack *>( i );
+         if (pi)
+            pi->SetSolo(soloed);   // and solo it as well
       }
    }
    else
@@ -5522,26 +5546,32 @@ void AudacityProject::HandleTrackSolo(Track *t, const bool alternate)
       // OR unmute and unsolo everything.
       TrackListIterator iter(GetTracks());
       Track *i = iter.First();
-      bool bWasSolo = t->GetSolo();
+      bool bWasSolo = pt->GetSolo();
       while (i) {
          if( i==t )
          {
-            i->SetSolo(!bWasSolo);
+            pt->SetSolo(!bWasSolo);
             if( IsSoloSimple() )
-               i->SetMute(false);
+               pt->SetMute(false);
             if(t->GetLinked())
             {
                i = iter.Next();
-               i->SetSolo(!bWasSolo);
-               if( IsSoloSimple() )
-                  i->SetMute(false);
+               auto pi = dynamic_cast<PlayableTrack *>( i );
+               if (pi) {
+                  pi->SetSolo(!bWasSolo);
+                  if( IsSoloSimple() )
+                     pi->SetMute(false);
+               }
             }
          }
          else
          {
-            i->SetSolo(false);
-            if( IsSoloSimple() )
-               i->SetMute(!bWasSolo);
+            auto pi = dynamic_cast<PlayableTrack *>( i );
+            if (pi) {
+               pi->SetSolo(false);
+               if( IsSoloSimple() )
+                  pi->SetMute(!bWasSolo);
+            }
          }
          i = iter.Next();
       }
diff --git a/src/Track.cpp b/src/Track.cpp
index 7a5d93a82..166b2393b 100644
--- a/src/Track.cpp
+++ b/src/Track.cpp
@@ -50,8 +50,6 @@ Track::Track(const std::shared_ptr<DirManager> &projDirManager)
    mList      = NULL;
    mSelected  = false;
    mLinked    = false;
-   mMute      = false;
-   mSolo      = false;
 
    mY = 0;
    mHeight = 150;
@@ -92,8 +90,6 @@ void Track::Init(const Track &orig)
 
    mSelected = orig.mSelected;
    mLinked = orig.mLinked;
-   mMute = orig.mMute;
-   mSolo = orig.mSolo;
    mHeight = orig.mHeight;
    mMinimized = orig.mMinimized;
    mChannel = orig.mChannel;
@@ -112,8 +108,6 @@ void Track::SetSelected(bool s)
 void Track::Merge(const Track &orig)
 {
    mSelected = orig.mSelected;
-   mMute = orig.mMute;
-   mSolo = orig.mSolo;
 }
 
 Track::~Track()
@@ -331,6 +325,22 @@ bool Track::SyncLockAdjust(double oldT1, double newT1)
    return true;
 }
 
+void PlayableTrack::Init( const PlayableTrack &orig )
+{
+   mMute = orig.mMute;
+   mSolo = orig.mSolo;
+   AudioTrack::Init( orig );
+}
+
+void PlayableTrack::Merge( const Track &orig )
+{
+   auto pOrig = dynamic_cast<const PlayableTrack *>(&orig);
+   wxASSERT( pOrig );
+   mMute = pOrig->mMute;
+   mSolo = pOrig->mSolo;
+   AudioTrack::Merge( *pOrig );
+}
+
 // TrackListIterator
 TrackListIterator::TrackListIterator(TrackList * val)
    : l(val)
@@ -1208,7 +1218,9 @@ unsigned TrackList::GetNumExportChannels(bool selectionOnly) const
    for (tr = iter.First(this); tr != NULL; tr = iter.Next()) {
 
       // Want only unmuted wave tracks.
-      if ((tr->GetKind() != Track::Wave) || tr->GetMute())
+      auto wt = static_cast<const WaveTrack *>(tr);
+      if ((tr->GetKind() != Track::Wave) ||
+          wt->GetMute())
          continue;
 
       // do we only want selected ones?
@@ -1265,8 +1277,9 @@ namespace {
 
       for (; p != end; ++p) {
          const auto &track = *p;
+         auto wt = static_cast<const WaveTrack *>(&*track);
          if (track->GetKind() == Track::Wave &&
-            (includeMuted || !track->GetMute()) &&
+            (includeMuted || !wt->GetMute()) &&
             (track->GetSelected() || !selectionOnly)) {
             waveTrackArray.push_back(static_cast<WaveTrack*>(track.get()));
          }
diff --git a/src/Track.h b/src/Track.h
index fb527aa94..39a994168 100644
--- a/src/Track.h
+++ b/src/Track.h
@@ -140,8 +140,6 @@ class AUDACITY_DLL_API Track /* not final */ : public XMLTagHandler
  protected:
    int                 mChannel;
    double              mOffset;
-   bool                mMute;
-   bool                mSolo;
 
    mutable std::shared_ptr<DirManager> mDirManager;
 
@@ -189,14 +187,10 @@ class AUDACITY_DLL_API Track /* not final */ : public XMLTagHandler
    void SetDefaultName( const wxString &n ) { mDefaultName = n; }
 
    bool GetSelected() const { return mSelected; }
-   bool GetMute    () const { return mMute;     }
    bool GetLinked  () const { return mLinked;   }
-   bool GetSolo    () const { return mSolo;     }
 
    virtual void SetSelected(bool s);
-   void SetMute    (bool m) { mMute     = m; }
    void SetLinked  (bool l);
-   void SetSolo    (bool s) { mSolo     = s; }
 
    int    GetChannel() const { return mChannel; }
    virtual double GetOffset() const = 0;
@@ -265,6 +259,18 @@ public:
    PlayableTrack(const std::shared_ptr<DirManager> &projDirManager)
       : AudioTrack{ projDirManager } {}
    PlayableTrack(const Track &orig) : AudioTrack{ orig } {}
+
+   bool GetMute    () const { return mMute;     }
+   bool GetSolo    () const { return mSolo;     }
+   void SetMute    (bool m) { mMute     = m; }
+   void SetSolo    (bool s) { mSolo     = s; }
+
+   void Init( const PlayableTrack &init );
+   void Merge( const Track &init ) override;
+
+protected:
+   bool                mMute { false };
+   bool                mSolo { false };
 };
 
 class AUDACITY_DLL_API TrackListIterator /* not final */
diff --git a/src/TrackArtist.cpp b/src/TrackArtist.cpp
index 7ed78c988..559c41280 100644
--- a/src/TrackArtist.cpp
+++ b/src/TrackArtist.cpp
@@ -336,7 +336,8 @@ void TrackArtist::DrawTracks(TrackList * tracks,
 
    bool hasSolo = false;
    for (t = iter.First(); t; t = iter.Next()) {
-      if (t->GetSolo()) {
+      auto pt = dynamic_cast<const PlayableTrack *>(t);
+      if (pt && pt->GetSolo()) {
          hasSolo = true;
          break;
       }
@@ -457,7 +458,8 @@ void TrackArtist::DrawTrack(const Track * t,
          clip->ClearDisplayRect();
       }
 
-      bool muted = (hasSolo || t->GetMute()) && !t->GetSolo();
+      bool muted = (hasSolo || wt->GetMute()) &&
+         !wt->GetSolo();
 
 #if defined(__WXMAC__)
       wxAntialiasMode aamode = dc.GetGraphicsContext()->GetAntialiasMode();
@@ -493,7 +495,11 @@ void TrackArtist::DrawTrack(const Track * t,
    #ifdef USE_MIDI
    case Track::Note:
    {
-      bool muted = (hasSolo || t->GetMute()) && !t->GetSolo();
+      auto nt = static_cast<const NoteTrack *>(t);
+      bool muted = false;
+#ifdef EXPERIMENTAL_MIDI_OUT
+      muted = (hasSolo || nt->GetMute()) && !nt->GetSolo();
+#endif
       DrawNoteTrack((NoteTrack *)t, dc, rect, selectedRegion, zoomInfo, muted);
       break;
    }
diff --git a/src/TrackPanel.cpp b/src/TrackPanel.cpp
index a9e947079..14a71406e 100644
--- a/src/TrackPanel.cpp
+++ b/src/TrackPanel.cpp
@@ -9288,18 +9288,19 @@ void TrackInfo::DrawMuteSolo(wxDC * dc, const wxRect & rect, Track * t,
       return; // don't draw mute and solo buttons, because they don't fit into track label
 
    AColor::MediumTrackInfo( dc, t->GetSelected());
+   auto pt = dynamic_cast<const PlayableTrack *>(t);
    if( solo )
    {
-      if( t->GetSolo() )
+      if( pt && pt->GetSolo() )
       {
-         AColor::Solo(dc, t->GetSolo(), t->GetSelected());
+         AColor::Solo(dc, pt->GetSolo(), t->GetSelected());
       }
    }
    else
    {
-      if( t->GetMute() )
+      if( pt && pt->GetMute() )
       {
-         AColor::Mute(dc, t->GetMute(), t->GetSelected(), t->GetSolo());
+         AColor::Mute(dc, pt->GetMute(), t->GetSelected(), pt->GetSolo());
       }
    }
    //(solo) ? AColor::Solo(dc, t->GetSolo(), t->GetSelected()) :
@@ -9318,7 +9319,11 @@ void TrackInfo::DrawMuteSolo(wxDC * dc, const wxRect & rect, Track * t,
    dc->GetTextExtent(str, &textWidth, &textHeight);
    dc->DrawText(str, bev.x + (bev.width - textWidth) / 2, bev.y + (bev.height - textHeight) / 2);
 
-   AColor::BevelTrackInfo(*dc, (solo?t->GetSolo():t->GetMute()) == down, bev);
+   AColor::BevelTrackInfo(
+      *dc,
+      (solo ? pt->GetSolo() : (pt && pt->GetMute())) == down,
+      bev
+   );
 
    if (solo && !down) {
       // Update the mute button, which may be grayed out depending on
diff --git a/src/TrackPanelAx.cpp b/src/TrackPanelAx.cpp
index bf9a4ec7c..3f8774428 100644
--- a/src/TrackPanelAx.cpp
+++ b/src/TrackPanelAx.cpp
@@ -363,7 +363,8 @@ wxAccStatus TrackPanelAx::GetName( int childId, wxString* name )
 #endif
 
             // LLL: Remove these during "refactor"
-            if( t->GetMute() )
+            auto pt = dynamic_cast<PlayableTrack *>(t);
+            if( pt && pt->GetMute() )
             {
                // The following comment also applies to the solo, selected,
                // and synclockselected states.
@@ -376,7 +377,7 @@ wxAccStatus TrackPanelAx::GetName( int childId, wxString* name )
                name->Append( wxT(" ") + wxString(_( " Mute On" )) );
             }
 
-            if( t->GetSolo() )
+            if( pt && pt->GetSolo() )
             {
                /* i18n-hint: This is for screen reader software and indicates that
                   on this track solo is on.*/
@@ -547,12 +548,13 @@ wxAccStatus TrackPanelAx::GetValue( int WXUNUSED(childId), wxString* WXUNUSED(st
          }
 
          // LLL: Remove these during "refactor"
-         if( t->GetMute() )
+         auto pt = dynamic_cast<PlayableTrack *>(t);
+         if( pt && pt->GetMute() )
          {
             strValue->Append( _( " Mute On" ) );
          }
 
-         if( t->GetSolo() )
+         if( pt && pt->GetSolo() )
          {
             strValue->Append( _( " Solo On" ) );
          }
diff --git a/src/commands/GetProjectInfoCommand.cpp b/src/commands/GetProjectInfoCommand.cpp
index 047809c90..5d34168a6 100644
--- a/src/commands/GetProjectInfoCommand.cpp
+++ b/src/commands/GetProjectInfoCommand.cpp
@@ -161,10 +161,12 @@ bool GetProjectInfoCommand::testLinked(const Track * track) const
 
 bool GetProjectInfoCommand::testSolo(const Track * track) const
 {
-   return track->GetSolo();
+   auto pt = dynamic_cast<const PlayableTrack *>(track);
+   return pt && pt->GetSolo();
 }
 
 bool GetProjectInfoCommand::testMute(const Track * track) const
 {
-   return track->GetMute();
+   auto pt = dynamic_cast<const PlayableTrack *>(track);
+   return pt && pt->GetMute();
 }
diff --git a/src/commands/GetTrackInfoCommand.cpp b/src/commands/GetTrackInfoCommand.cpp
index f0889e837..455a799d8 100644
--- a/src/commands/GetTrackInfoCommand.cpp
+++ b/src/commands/GetTrackInfoCommand.cpp
@@ -127,15 +127,17 @@ bool GetTrackInfoCommand::Apply(CommandExecutionContext context)
    }
    else if (mode.IsSameAs(wxT("Solo")))
    {
-      if (t->GetKind() == Track::Wave)
-         SendBooleanStatus(t->GetSolo());
+      auto pt = dynamic_cast<const PlayableTrack *>(t);
+      if (pt)
+         SendBooleanStatus(pt->GetSolo());
       else
          SendBooleanStatus(false);
    }
    else if (mode.IsSameAs(wxT("Mute")))
    {
-      if (t->GetKind() == Track::Wave)
-         SendBooleanStatus(t->GetMute());
+      auto pt = dynamic_cast<const PlayableTrack *>(t);
+      if (pt)
+         SendBooleanStatus(pt->GetMute());
       else
          SendBooleanStatus(false);
    }
diff --git a/src/commands/SetProjectInfoCommand.cpp b/src/commands/SetProjectInfoCommand.cpp
index 0ae857f8e..d15180cfd 100644
--- a/src/commands/SetProjectInfoCommand.cpp
+++ b/src/commands/SetProjectInfoCommand.cpp
@@ -98,12 +98,14 @@ void SetProjectInfoCommand::setSelected(Track * trk, bool param) const
 
 void SetProjectInfoCommand::setSolo(Track * trk, bool param) const
 {
-   if(trk->GetKind() == Track::Wave)
-      trk->SetSolo(param);
+   auto pt = dynamic_cast<PlayableTrack *>(trk);
+   if (pt)
+      pt->SetSolo(param);
 }
 
 void SetProjectInfoCommand::setMute(Track * trk, bool param) const
 {
-   if(trk->GetKind() == Track::Wave)
-      trk->SetMute(param);
+   auto pt = dynamic_cast<PlayableTrack *>(trk);
+   if (pt)
+      pt->SetMute(param);
 }
diff --git a/src/export/Export.cpp b/src/export/Export.cpp
index e92a7cbda..a4dde5947 100644
--- a/src/export/Export.cpp
+++ b/src/export/Export.cpp
@@ -425,7 +425,9 @@ bool Exporter::ExamineTracks()
 
    while (tr) {
       if (tr->GetKind() == Track::Wave) {
-         if ( (tr->GetSelected() || !mSelectedOnly) && !tr->GetMute() ) {  // don't count muted tracks
+         auto wt = static_cast<const WaveTrack *>(tr);
+         if ( (tr->GetSelected() || !mSelectedOnly) &&
+              !wt->GetMute() ) {  // don't count muted tracks
             mNumSelected++;
 
             if (tr->GetChannel() == Track::LeftChannel) {
@@ -1255,7 +1257,9 @@ ExportMixerDialog::ExportMixerDialog( const TrackList *tracks, bool selectedOnly
 
    for( const Track *t = iter.First(); t; t = iter.Next() )
    {
-      if( t->GetKind() == Track::Wave && ( t->GetSelected() || !selectedOnly ) && !t->GetMute() )
+      auto wt = static_cast<const WaveTrack *>(t);
+      if( t->GetKind() == Track::Wave && ( t->GetSelected() || !selectedOnly ) &&
+         !wt->GetMute() )
       {
          numTracks++;
          const wxString sTrackName = (t->GetName()).Left(20);
diff --git a/src/export/ExportMultiple.cpp b/src/export/ExportMultiple.cpp
index 0c1dddb21..928c881a1 100644
--- a/src/export/ExportMultiple.cpp
+++ b/src/export/ExportMultiple.cpp
@@ -154,7 +154,8 @@ void ExportMultiple::CountTracksAndLabels()
          // Count WaveTracks, and for linked pairs, count only the second of the pair.
          case Track::Wave:
          {
-            if (!pTrack->GetMute() && !pTrack->GetLinked()) // Don't count muted tracks.
+            auto wt = static_cast<const WaveTrack *>(pTrack);
+            if (!wt->GetMute() && !pTrack->GetLinked()) // Don't count muted tracks.
                mNumWaveTracks++;
             break;
          }
@@ -811,7 +812,9 @@ ProgressResult ExportMultiple::ExportMultipleByTrack(bool byName,
    for (tr = iter.First(mTracks); tr != NULL; tr = iter.Next()) {
 
       // Want only non-muted wave tracks.
-      if ((tr->GetKind() != Track::Wave)  || tr->GetMute())
+      auto wt = static_cast<const WaveTrack *>(tr);
+      if ((tr->GetKind() != Track::Wave) ||
+          wt->GetMute())
          continue;
 
       // Get the times for the track
@@ -898,7 +901,8 @@ ProgressResult ExportMultiple::ExportMultipleByTrack(bool byName,
    for (tr = iter.First(mTracks); tr != NULL; tr = iter.Next()) {
 
       // Want only non-muted wave tracks.
-      if ((tr->GetKind() != Track::Wave) || (tr->GetMute() == true)) {
+      auto wt = static_cast<const WaveTrack *>(tr);
+      if ((tr->GetKind() != Track::Wave) || (wt->GetMute())) {
          continue;
       }