diff --git a/src/FreqWindow.cpp b/src/FreqWindow.cpp
index 081d0807f..16a723d1b 100644
--- a/src/FreqWindow.cpp
+++ b/src/FreqWindow.cpp
@@ -82,6 +82,9 @@ and in the spectrogram spectral selection.
 
 #include "Experimental.h"
 
+#include "./widgets/LinkingHtmlWindow.h"
+#include "./widgets/HelpSystem.h"
+
 DEFINE_EVENT_TYPE(EVT_FREQWINDOW_RECALC);
 
 enum {
@@ -169,6 +172,7 @@ BEGIN_EVENT_TABLE(FreqWindow, wxDialogWrapper)
    EVT_BUTTON(FreqExportButtonID, FreqWindow::OnExport)
    EVT_BUTTON(ReplotButtonID, FreqWindow::OnReplot)
    EVT_BUTTON(wxID_CANCEL, FreqWindow::OnCloseButton)
+   EVT_BUTTON(wxID_HELP, FreqWindow::OnGetURL)
    EVT_CHECKBOX(GridOnOffID, FreqWindow::OnGridOnOff)
    EVT_COMMAND(wxID_ANY, EVT_FREQWINDOW_RECALC, FreqWindow::OnRecalc)
 END_EVENT_TABLE()
@@ -384,7 +388,7 @@ FreqWindow::FreqWindow(wxWindow * parent, wxWindowID id,
          S.SetSizerProportion(1);
          S.StartMultiColumn(4);
          S.SetStretchyCol(1);
-         S.SetStretchyCol(3);
+         S.SetStretchyCol(5);
          {
             S.AddPrompt(wxT("Cursor:"));
 
@@ -395,6 +399,10 @@ FreqWindow::FreqWindow(wxWindow * parent, wxWindowID id,
 
             S.SetStyle(wxTE_READONLY);
             mPeakText = S.AddTextBox(wxT(""), wxT(""), 10);
+            S.AddSpace(5);
+
+            mGridOnOff = S.Id(GridOnOffID).AddCheckBox(_("&Grids"), wxT("false"));
+            mGridOnOff->SetValue(mDrawGrid);
          }
          S.EndMultiColumn();
       }
@@ -412,7 +420,7 @@ FreqWindow::FreqWindow(wxWindow * parent, wxWindowID id,
 
    S.SetBorder(2);
    S.SetSizerProportion(0);
-   S.StartMultiColumn(11, wxALIGN_CENTER);
+   S.StartMultiColumn(9, wxALIGN_CENTER);
    {
       // ----------------------------------------------------------------
       // ROW 6: Algorithm, Size, Export, Replot
@@ -436,9 +444,6 @@ FreqWindow::FreqWindow(wxWindow * parent, wxWindowID id,
 
       S.AddSpace(5);
 
-      mReplotButton = S.Id(ReplotButtonID).AddButton(_("&Replot..."));
-
-      S.AddSpace(5);
 
       // ----------------------------------------------------------------
       // ROW 7: Function, Axix, Grids, Close
@@ -460,16 +465,16 @@ FreqWindow::FreqWindow(wxWindow * parent, wxWindowID id,
 
       S.AddSpace(5);
 
-      mGridOnOff = S.Id(GridOnOffID).AddCheckBox(_("&Grids"), wxT("false"));
-      mGridOnOff->SetValue(mDrawGrid);
+      mReplotButton = S.Id(ReplotButtonID).AddButton(_("&Replot..."));
 
       S.AddSpace(5);
 
-      mCloseButton = S.Id(wxID_CANCEL).AddButton(_("&Close"));
+      //mCloseButton = S.Id(wxID_CANCEL).AddButton(_("&Close"));
 
-      S.AddSpace(5);
+      //S.AddSpace(5);
    }
    S.EndMultiColumn();
+   S.AddStandardButtons( eHelpButton | eCloseButton );
 
    // -------------------------------------------------------------------
    // ROW 8: Spacer
@@ -488,8 +493,8 @@ FreqWindow::FreqWindow(wxWindow * parent, wxWindowID id,
    }
    mLogAxis = mAxis != 0;
 
-   mCloseButton->SetDefault();
-   mCloseButton->SetFocus();
+   //mCloseButton->SetDefault();
+   //mCloseButton->SetFocus();
 
    Layout();
    Fit();
@@ -520,6 +525,13 @@ FreqWindow::~FreqWindow()
 {
 }
 
+void FreqWindow::OnGetURL(wxCommandEvent & WXUNUSED(event))
+{
+   // Original help page is back on-line (March 2016), but the manual should be more reliable.
+   // http://www.eramp.com/WCAG_2_audio_contrast_tool_help.htm
+   HelpSystem::ShowHelpDialog(this, wxT("Plot Spectrum"));
+}
+
 bool FreqWindow::Show(bool show)
 {
    if (!show)
diff --git a/src/FreqWindow.h b/src/FreqWindow.h
index 153f16d93..c99125d1c 100644
--- a/src/FreqWindow.h
+++ b/src/FreqWindow.h
@@ -139,6 +139,7 @@ private:
 
    void OnCloseWindow(wxCloseEvent & event);
    void OnCloseButton(wxCommandEvent & event);
+   void OnGetURL(wxCommandEvent & event);
    void OnSize(wxSizeEvent & event);
    void OnPanScroller(wxScrollEvent & event);
    void OnZoomSlider(wxCommandEvent & event);
diff --git a/src/effects/Contrast.cpp b/src/effects/Contrast.cpp
index 251123ad9..fde290820 100644
--- a/src/effects/Contrast.cpp
+++ b/src/effects/Contrast.cpp
@@ -122,10 +122,10 @@ void ContrastDialog::SetStartAndEndTime()
 enum {
    ID_BUTTON_USECURRENTF = 10001,
    ID_BUTTON_USECURRENTB,
-   ID_BUTTON_GETURL,
+   //ID_BUTTON_GETURL,
    ID_BUTTON_EXPORT,
    ID_BUTTON_RESET,
-   ID_BUTTON_CLOSE,
+   //ID_BUTTON_CLOSE,
    ID_FOREGROUNDSTART_T,
    ID_FOREGROUNDEND_T,
    ID_BACKGROUNDSTART_T,
@@ -139,10 +139,10 @@ enum {
 BEGIN_EVENT_TABLE(ContrastDialog,wxDialogWrapper)
    EVT_BUTTON(ID_BUTTON_USECURRENTF, ContrastDialog::OnGetForeground)
    EVT_BUTTON(ID_BUTTON_USECURRENTB, ContrastDialog::OnGetBackground)
-   EVT_BUTTON(ID_BUTTON_GETURL, ContrastDialog::OnGetURL)
+   EVT_BUTTON(wxID_HELP, ContrastDialog::OnGetURL)
    EVT_BUTTON(ID_BUTTON_EXPORT, ContrastDialog::OnExport)
    EVT_BUTTON(ID_BUTTON_RESET, ContrastDialog::OnReset)
-   EVT_BUTTON(ID_BUTTON_CLOSE, ContrastDialog::OnClose)
+   EVT_BUTTON(wxID_CANCEL, ContrastDialog::OnClose)
 END_EVENT_TABLE()
 
 /* i18n-hint: WCAG2 is the 'Web Content Accessibility Guidelines (WCAG) 2.0', see http://www.w3.org/TR/WCAG20/ */
@@ -294,6 +294,8 @@ ContrastDialog::ContrastDialog(wxWindow * parent, wxWindowID id,
       S.EndMultiColumn();
    }
    S.EndStatic();
+   S.AddStandardButtons(eCloseButton |eHelpButton);
+#if 0
    S.StartMultiColumn(3, wxEXPAND);
    {
       S.SetStretchyCol(1);
@@ -302,6 +304,7 @@ ContrastDialog::ContrastDialog(wxWindow * parent, wxWindowID id,
       m_pButton_Close = S.Id(ID_BUTTON_CLOSE).AddButton(_("&Close"));
    }
    S.EndMultiColumn();
+#endif
    Layout();
    Fit();
    SetMinSize(GetSize());