diff --git a/include/audacity/EffectInterface.h b/include/audacity/EffectInterface.h
old mode 100644
new mode 100755
index 7354a9f6c..78e894781
--- a/include/audacity/EffectInterface.h
+++ b/include/audacity/EffectInterface.h
@@ -94,7 +94,8 @@ public:
    virtual ~EffectHostInterface() {};
 
    virtual double GetDefaultDuration() = 0;
-   virtual double GetDuration(bool *isSelection = NULL) = 0;
+   virtual double GetDuration() = 0;
+   virtual wxString GetDurationFormat() = 0;
    virtual void SetDuration(double seconds) = 0;
 
    virtual bool Apply() = 0;
diff --git a/src/effects/DtmfGen.cpp b/src/effects/DtmfGen.cpp
old mode 100644
new mode 100755
index b90225502..90ba2a300
--- a/src/effects/DtmfGen.cpp
+++ b/src/effects/DtmfGen.cpp
@@ -303,16 +303,13 @@ void EffectDtmf::PopulateOrExchange(ShuttleGui & S)
       vldAmp.SetRange(MIN_Amplitude, MAX_Amplitude);
       S.Id(ID_Amplitude).AddTextBox(_("Amplitude (0-1):"), wxT(""), 10)->SetValidator(vldAmp);
 
-      bool isSelection;
-      double duration = GetDuration(&isSelection);
-
       S.AddPrompt(_("Duration:"));
       mDtmfDurationT = new
          NumericTextCtrl(NumericConverter::TIME,
                          S.GetParent(),
                          ID_Duration,
-                         isSelection ? _("hh:mm:ss + samples") : _("hh:mm:ss + milliseconds"),
-                         duration,
+                         GetDurationFormat(),
+                         GetDuration(),
                          mProjectRate,
                          wxDefaultPosition,
                          wxDefaultSize,
@@ -370,8 +367,8 @@ bool EffectDtmf::TransferDataFromWindow()
       return false;
    }
 
-//   dtmfDutyCycle = (double) mDtmfDutyCycleS->GetValue() / SCL_DutyCycle;
-//   SetDuration(mDtmfDurationT->GetValue());
+   dtmfDutyCycle = (double) mDtmfDutyCycleS->GetValue() / SCL_DutyCycle;
+   SetDuration(mDtmfDurationT->GetValue());
 
    // recalculate to make sure all values are up-to-date. This is especially
    // important if the user did not change any values in the dialog
diff --git a/src/effects/Effect.cpp b/src/effects/Effect.cpp
index afd98bd71..ab3644037 100755
--- a/src/effects/Effect.cpp
+++ b/src/effects/Effect.cpp
@@ -705,49 +705,21 @@ double Effect::GetDefaultDuration()
    return 30.0;
 }
 
-double Effect::GetDuration(bool *isSelection)
+double Effect::GetDuration()
 {
-   if (mT1 > mT0)
-   {
-      // there is a selection: let's fit in there...
-      // MJS: note that this is just for the TTC and is independent of the track rate
-      // but we do need to make sure we have the right number of samples at the project rate
-      double quantMT0 = QUANTIZED_TIME(mT0, mProjectRate);
-      double quantMT1 = QUANTIZED_TIME(mT1, mProjectRate);
-      mDuration = quantMT1 - quantMT0;
-
-      if (isSelection)
-      {
-         *isSelection = true;
-      }
-
-      return mDuration;
-   }
-
-   if (isSelection)
-   {
-      *isSelection = false;
-   }
-
-   GetPrivateConfig(GetCurrentSettingsGroup(), wxT("LastUsedDuration"), mDuration, 0.0);
-   if (mDuration > 0.0)
-   {
-      return mDuration;
-   }
-
    if (mDuration < 0.0)
    {
       mDuration = 0.0;
    }
 
-   if (GetType() == EffectTypeGenerate)
-   {
-      mDuration = GetDefaultDuration();
-   }
-
    return mDuration;
 }
 
+wxString Effect::GetDurationFormat()
+{
+   return mDurationFormat;
+}
+
 void Effect::SetDuration(double seconds)
 {
    if (seconds < 0.0)
@@ -755,14 +727,17 @@ void Effect::SetDuration(double seconds)
       seconds = 0.0;
    }
 
-   if (mDuration != seconds)
+   if (GetType() == EffectTypeGenerate)
    {
       SetPrivateConfig(GetCurrentSettingsGroup(), wxT("LastUsedDuration"), seconds);
    }
 
    mDuration = seconds;
+   mT1 = mT0 + mDuration;
    mSetDuration = mDuration;
 
+   mIsSelection = false;
+
    return;
 }
 
@@ -1170,9 +1145,33 @@ bool Effect::DoEffect(wxWindow *parent,
    mProjectRate = projectRate;
    mParent = parent;
    mTracks = list;
+   
+   bool isSelection = false;
+
+   mDuration = 0.0;
+
+   if (GetType() == EffectTypeGenerate)
+   {
+      GetPrivateConfig(GetCurrentSettingsGroup(), wxT("LastUsedDuration"), mDuration, GetDefaultDuration());
+   }
+
    mT0 = selectedRegion->t0();
    mT1 = selectedRegion->t1();
-   mDuration = GetDuration();
+   if (mT1 > mT0)
+   {
+      // there is a selection: let's fit in there...
+      // MJS: note that this is just for the TTC and is independent of the track rate
+      // but we do need to make sure we have the right number of samples at the project rate
+      double quantMT0 = QUANTIZED_TIME(mT0, mProjectRate);
+      double quantMT1 = QUANTIZED_TIME(mT1, mProjectRate);
+      mDuration = quantMT1 - quantMT0;
+      mT1 = mT0 + mDuration;
+
+      isSelection = true;
+   }
+
+   mDurationFormat = isSelection ? _("hh:mm:ss + samples") : _("hh:mm:ss + milliseconds");
+
 #ifdef EXPERIMENTAL_SPECTRAL_EDITING
    mF0 = selectedRegion->f0();
    mF1 = selectedRegion->f1();
diff --git a/src/effects/Effect.h b/src/effects/Effect.h
old mode 100644
new mode 100755
index e61d43039..e630c9916
--- a/src/effects/Effect.h
+++ b/src/effects/Effect.h
@@ -144,7 +144,8 @@ class AUDACITY_DLL_API Effect : public wxEvtHandler,
    // EffectHostInterface implementation
 
    virtual double GetDefaultDuration();
-   virtual double GetDuration(bool *isSelection = NULL);
+   virtual double GetDuration();
+   virtual wxString GetDurationFormat();
    virtual void SetDuration(double duration);
 
    virtual bool Apply();
@@ -400,7 +401,9 @@ private:
    bool mIsLinearEffect;
    bool mPreviewWithNotSelected;
 
+   bool mIsSelection;
    double mDuration;
+   wxString mDurationFormat;
    // mSetDuration should ONLY be set when SetDuration() is called.
    double mSetDuration;
 
diff --git a/src/effects/Noise.cpp b/src/effects/Noise.cpp
old mode 100644
new mode 100755
index 8ec5a7b33..7bf3ebbd2
--- a/src/effects/Noise.cpp
+++ b/src/effects/Noise.cpp
@@ -224,20 +224,17 @@ void EffectNoise::PopulateOrExchange(ShuttleGui & S)
       vldAmp.SetRange(MIN_Amp, MAX_Amp);
       S.AddTextBox(_("Amplitude (0-1):"), wxT(""), 12)->SetValidator(vldAmp);
 
-      bool isSelection;
-      double duration = GetDuration(&isSelection);
-
       S.AddPrompt(_("Duration:"));
       mNoiseDurationT = new
          NumericTextCtrl(NumericConverter::TIME,
-                           S.GetParent(),
-                           wxID_ANY,
-                           isSelection ? _("hh:mm:ss + samples") : _("hh:mm:ss + milliseconds"),
-                           duration,
-                           mProjectRate,
-                           wxDefaultPosition,
-                           wxDefaultSize,
-                           true);
+                         S.GetParent(),
+                         wxID_ANY,
+                         GetDurationFormat(),
+                         GetDuration(),
+                         mProjectRate,
+                         wxDefaultPosition,
+                         wxDefaultSize,
+                         true);
       mNoiseDurationT->SetName(_("Duration"));
       mNoiseDurationT->EnableMenu();
       S.AddWindow(mNoiseDurationT, wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL | wxALL);
diff --git a/src/effects/Silence.cpp b/src/effects/Silence.cpp
old mode 100644
new mode 100755
index 00f2306fe..bf2707ab6
--- a/src/effects/Silence.cpp
+++ b/src/effects/Silence.cpp
@@ -55,16 +55,13 @@ void EffectSilence::PopulateOrExchange(ShuttleGui & S)
    {
       S.StartHorizontalLay();
       {
-         bool isSelection;
-         double duration = GetDuration(&isSelection);
-
          S.AddPrompt(_("Duration:"));
          mDurationT = new
             NumericTextCtrl(NumericConverter::TIME,
                               S.GetParent(),
                               wxID_ANY,
-                              isSelection ? _("hh:mm:ss + samples") : _("hh:mm:ss + milliseconds"),
-                              duration,
+                              GetDurationFormat(),
+                              GetDuration(),
                               mProjectRate,
                               wxDefaultPosition,
                               wxDefaultSize,
diff --git a/src/effects/ToneGen.cpp b/src/effects/ToneGen.cpp
old mode 100644
new mode 100755
index 66a1c7a51..dd425bc35
--- a/src/effects/ToneGen.cpp
+++ b/src/effects/ToneGen.cpp
@@ -394,20 +394,17 @@ void EffectToneGen::PopulateOrExchange(ShuttleGui & S)
          t->SetValidator(vldAmplitude);
       }
 
-      bool isSelection;
-      double duration = GetDuration(&isSelection);
-
       S.AddPrompt(_("Duration:"));
       mToneDurationT = new
          NumericTextCtrl(NumericConverter::TIME,
-                        S.GetParent(),
-                        wxID_ANY,
-                        isSelection ? _("hh:mm:ss + samples") : _("hh:mm:ss + milliseconds"),
-                        duration,
-                        mProjectRate,
-                        wxDefaultPosition,
-                        wxDefaultSize,
-                        true);
+                         S.GetParent(),
+                         wxID_ANY,
+                         GetDurationFormat(),
+                         GetDuration(),
+                         mProjectRate,
+                         wxDefaultPosition,
+                         wxDefaultSize,
+                         true);
       mToneDurationT->SetName(_("Duration"));
       mToneDurationT->EnableMenu();
       S.AddWindow(mToneDurationT, wxALIGN_LEFT | wxALL);
diff --git a/src/effects/VST/VSTEffect.cpp b/src/effects/VST/VSTEffect.cpp
index b277f8e05..c51f8e3c4 100755
--- a/src/effects/VST/VSTEffect.cpp
+++ b/src/effects/VST/VSTEffect.cpp
@@ -3515,17 +3515,14 @@ void VSTEffect::BuildPlain()
    // Add the duration control for generators
    if (GetType() == EffectTypeGenerate)
    {
-      bool isSelection;
-      double duration = mHost->GetDuration(&isSelection);
-
       wxControl *item = new wxStaticText(scroller, 0, _("Duration:"));
       gridSizer->Add(item, 0, wxALIGN_CENTER_VERTICAL | wxALIGN_RIGHT | wxALL, 5);
       mDuration = new
          NumericTextCtrl(NumericConverter::TIME,
                          scroller,
                          ID_Duration,
-                         isSelection ? _("hh:mm:ss + samples") : _("hh:mm:ss + milliseconds"),
-                         duration,
+                         mHost->GetDurationFormat(),
+                         mHost->GetDuration(),
                          mSampleRate,
                          wxDefaultPosition,
                          wxDefaultSize,
diff --git a/src/effects/ladspa/LadspaEffect.cpp b/src/effects/ladspa/LadspaEffect.cpp
old mode 100644
new mode 100755
index 113dc0367..cb5a83ab5
--- a/src/effects/ladspa/LadspaEffect.cpp
+++ b/src/effects/ladspa/LadspaEffect.cpp
@@ -1146,17 +1146,14 @@ bool LadspaEffect::PopulateUI(wxWindow *parent)
       // Add the duration control for generators
       if (GetType() == EffectTypeGenerate)
       {
-         bool isSelection;
-         double duration = mHost->GetDuration(&isSelection);
-
          item = new wxStaticText(w, 0, _("Duration:"));
          gridSizer->Add(item, 0, wxALIGN_CENTER_VERTICAL | wxALIGN_RIGHT | wxALL, 5);
          mDuration = new
             NumericTextCtrl(NumericConverter::TIME,
                             w,
                             ID_Duration,
-                            isSelection ? _("hh:mm:ss + samples") : _("hh:mm:ss + milliseconds"),
-                            duration,
+                            mHost->GetDurationFormat(),
+                            mHost->GetDuration(),
                             mSampleRate,
                             wxDefaultPosition,
                             wxDefaultSize,
diff --git a/src/effects/lv2/LV2Effect.cpp b/src/effects/lv2/LV2Effect.cpp
old mode 100644
new mode 100755
index 29f82e5ff..318d0d9d2
--- a/src/effects/lv2/LV2Effect.cpp
+++ b/src/effects/lv2/LV2Effect.cpp
@@ -1579,17 +1579,14 @@ bool LV2Effect::BuildPlain()
 
       wxBoxSizer *sizer = new wxBoxSizer(wxHORIZONTAL);
    
-      bool isSelection;
-      double duration = mHost->GetDuration(&isSelection);
-
       wxWindow *item = new wxStaticText(w, 0, _("&Duration:"));
       sizer->Add(item, 0, wxALIGN_CENTER | wxALL, 5);
       mDuration = new
          NumericTextCtrl(NumericConverter::TIME,
                          w,
                          ID_Duration,
-                         isSelection ? _("hh:mm:ss + samples") : _("hh:mm:ss + milliseconds"),
-                         duration,
+                         mHost->GetDurationFormat(),
+                         mHost->GetDuration(),
                          mSampleRate,
                          wxDefaultPosition,
                          wxDefaultSize,