Modified to allow compile with USE_MIDI turned off (no NoteTrack). Tested with USE_MIDI both defined and undefined when compiled as Unicode Debug/Win32.

src/TrackPanel.cpp

@@ -2950,7 +2950,11 @@ void TrackPanel::DoSlide(wxMouseEvent & event)
    {
       // Make sure we always have the first linked track of a stereo track
       if (!mouseTrack->GetLinked() && mTracks->GetLink(mouseTrack))
-         mouseTrack = mTracks->GetLink(mouseTrack);
+         mouseTrack = 
+#ifndef USE_MIDI
+                      (WaveTrack *)
+#endif
+                                    mTracks->GetLink(mouseTrack);
 
       // Temporary apply the offset because we want to see if the
       // track fits with the desired offset

src/effects/SoundTouchEffect.cpp

@@ -35,6 +35,7 @@ bool EffectSoundTouch::ProcessLabelTrack(Track *track)
    return true;
 }
 
+#ifdef USE_MIDI
 bool EffectSoundTouch::ProcessNoteTrack(Track *track)
 {
    NoteTrack *nt = (NoteTrack *) track;
@@ -42,6 +43,7 @@ bool EffectSoundTouch::ProcessNoteTrack(Track *track)
    nt->WarpAndTransposeNotes(mCurT0, mCurT1, *GetTimeWarper(), mSemitones);
    return true;
 }
+#endif
 
 bool EffectSoundTouch::Process()
 {

src/effects/SoundTouchEffect.h

@@ -48,7 +48,9 @@ class EffectSoundTouch:public Effect {
 
  private:
    bool ProcessLabelTrack(Track *track);
+#ifdef USE_MIDI
    bool ProcessNoteTrack(Track *track);
+#endif
    bool ProcessOne(WaveTrack * t, sampleCount start, sampleCount end);
    bool ProcessStereo(WaveTrack* leftTrack, WaveTrack* rightTrack, 
                         sampleCount start, sampleCount end);