diff --git a/src/effects/Effect.cpp b/src/effects/Effect.cpp
index 161669626..f09bbf1de 100644
--- a/src/effects/Effect.cpp
+++ b/src/effects/Effect.cpp
@@ -1202,7 +1202,9 @@ bool Effect::DoEffect(wxWindow *parent,
       ReplaceProcessedTracks( false );
    } );
 
-   if ((GetType() == EffectTypeGenerate) && (mNumTracks == 0) && GetPath() != NYQUIST_EFFECTS_PROMPT_ID) {
+   // We don't yet know the effect type for code in the Nyquist Prompt, so
+   // assume it requires a track and handle errors when the effect runs.
+   if ((GetType() == EffectTypeGenerate || GetPath() == NYQUIST_PROMPT_ID) && (mNumTracks == 0)) {
       newTrack = static_cast<WaveTrack*>(mTracks->Add(mFactory->NewWaveTrack()));
       newTrack->SetSelected(true);
    }
@@ -1218,8 +1220,8 @@ bool Effect::DoEffect(wxWindow *parent,
       double quantMT1 = QUANTIZED_TIME(mT1, mProjectRate);
       mDuration = quantMT1 - quantMT0;
       isSelection = true;
+      mT1 = mT0 + mDuration;
    }
-   mT1 = mT0 + mDuration;
 
    mDurationFormat = isSelection
       ? NumericConverter::TimeAndSampleFormat()
diff --git a/src/effects/nyquist/LoadNyquist.cpp b/src/effects/nyquist/LoadNyquist.cpp
index f4e0cc5b6..0e8c244f7 100644
--- a/src/effects/nyquist/LoadNyquist.cpp
+++ b/src/effects/nyquist/LoadNyquist.cpp
@@ -175,19 +175,10 @@ bool NyquistEffectsModule::AutoRegisterPlugins(PluginManagerInterface & pm)
    wxArrayString files;
    wxString ignoredErrMsg;
 
-#if 0
-   if (!pm.IsPluginRegistered(NYQUIST_EFFECTS_PROMPT_ID))
+   if (!pm.IsPluginRegistered(NYQUIST_PROMPT_ID))
    {
       // No checking of error ?
-      DiscoverPluginsAtPath(NYQUIST_EFFECTS_PROMPT_ID, ignoredErrMsg,
-         PluginManagerInterface::DefaultRegistrationCallback);
-   }
-#endif
-
-   if (!pm.IsPluginRegistered(NYQUIST_TOOLS_PROMPT_ID))
-   {
-      // No checking of error ?
-      DiscoverPluginsAtPath(NYQUIST_TOOLS_PROMPT_ID, ignoredErrMsg,
+      DiscoverPluginsAtPath(NYQUIST_PROMPT_ID, ignoredErrMsg,
          PluginManagerInterface::DefaultRegistrationCallback);
    }
 
@@ -215,9 +206,8 @@ wxArrayString NyquistEffectsModule::FindPluginPaths(PluginManagerInterface & pm)
    wxArrayString pathList = NyquistEffect::GetNyquistSearchPath();
    wxArrayString files;
 
-   // Add the Nyquist prompt effect and tool.
-   //files.Add(NYQUIST_EFFECTS_PROMPT_ID);
-   files.Add(NYQUIST_TOOLS_PROMPT_ID);
+   // Add the Nyquist prompt
+   files.Add(NYQUIST_PROMPT_ID);
    
    // Load .ny plug-ins
    pm.FindFilesInPathList(wxT("*.ny"), pathList, files);
@@ -249,7 +239,7 @@ bool NyquistEffectsModule::IsPluginValid(const wxString & path, bool bFast)
    // Ignores bFast parameter, since checking file exists is fast enough for
    // the small number of Nyquist plug-ins that we have.
    static_cast<void>(bFast);
-   if((path == NYQUIST_EFFECTS_PROMPT_ID) ||  (path == NYQUIST_TOOLS_PROMPT_ID))
+   if(path == NYQUIST_PROMPT_ID)
       return true;
 
    return wxFileName::FileExists(path);
diff --git a/src/effects/nyquist/Nyquist.cpp b/src/effects/nyquist/Nyquist.cpp
index 85f13eec3..b352a979a 100644
--- a/src/effects/nyquist/Nyquist.cpp
+++ b/src/effects/nyquist/Nyquist.cpp
@@ -156,19 +156,8 @@ NyquistEffect::NyquistEffect(const wxString &fName)
 
    mMaxLen = NYQ_MAX_LEN;
 
-   // Interactive Nyquist (for effects)
-   if (fName == NYQUIST_EFFECTS_PROMPT_ID) {
-      mName = XO("Nyquist Effects Prompt");
-      mType = EffectTypeProcess;
-      mPromptName = mName;
-      mPromptType = mType;
-      mOK = true;
-      mIsPrompt = true;
-      return;
-   }
-
-   // Interactive Nyquist (for general tools)
-   if (fName == NYQUIST_TOOLS_PROMPT_ID) {
+   // Interactive Nyquist
+   if (fName == NYQUIST_PROMPT_ID) {
       mName = XO("Nyquist Prompt");
       mType = EffectTypeTool;
       mIsTool = true;
@@ -204,9 +193,7 @@ NyquistEffect::~NyquistEffect()
 wxString NyquistEffect::GetPath()
 {
    if (mIsPrompt)
-      return (mPromptType == EffectTypeTool) ?
-         NYQUIST_TOOLS_PROMPT_ID :
-         NYQUIST_EFFECTS_PROMPT_ID;
+      return NYQUIST_PROMPT_ID;
 
    return mFileName.GetFullPath();
 }
@@ -214,9 +201,7 @@ wxString NyquistEffect::GetPath()
 ComponentInterfaceSymbol NyquistEffect::GetSymbol()
 {
    if (mIsPrompt)
-      return (mPromptType == EffectTypeTool) ?
-         XO("Nyquist Prompt") :
-         XO("Nyquist Effects Prompt");
+      return XO("Nyquist Prompt");
 
    return mName;
 }
@@ -1358,12 +1343,11 @@ bool NyquistEffect::ProcessOne()
          mDebugOutput = wxString::Format(_("nyx_error returned from %s.\n"),
                                          mName.IsEmpty()? _("plug-in") : mName) + mDebugOutput;
          mDebug = true;
-         return false;
       }
       else {
          wxLogMessage("Nyquist returned nyx_error:\n%s", mDebugOutput);
       }
-      return true;
+      return false;
    }
 
    if (rval == nyx_string) {
@@ -1477,7 +1461,7 @@ bool NyquistEffect::ProcessOne()
 
       if (mOutputTime <= 0) {
          Effect::MessageBox(_("Nyquist returned nil audio.\n"));
-         return true;
+         return false;
       }
    }
 
@@ -3207,16 +3191,15 @@ void * nyq_reformat_aud_do_response(const wxString & Str) {
 LVAL xlc_aud_do(void)
 {
 // Based on string-trim...
-    unsigned char *leftp,*rightp;
+    unsigned char *leftp;
     LVAL src,dst;
 
     /* get the string */
     src = xlgastring();
     xllastarg();
 
-    /* setup the string pointers */
+    /* setup the string pointer */
     leftp = getstring(src);
-    rightp = leftp + getslength(src) - 2;
 
     // Go call my real function here...
     dst = (LVAL)ExecForLisp( (char *)leftp );
diff --git a/src/effects/nyquist/Nyquist.h b/src/effects/nyquist/Nyquist.h
index 00d9942ad..7e931c7ff 100644
--- a/src/effects/nyquist/Nyquist.h
+++ b/src/effects/nyquist/Nyquist.h
@@ -34,8 +34,7 @@
  name into another alphabet.  */
 #define NYQUISTEFFECTS_FAMILY ( ComponentInterfaceSymbol{ XO("Nyquist") } )
 
-#define NYQUIST_EFFECTS_PROMPT_ID wxT("Nyquist Effects Prompt")
-#define NYQUIST_TOOLS_PROMPT_ID wxT("Nyquist Prompt")
+#define NYQUIST_PROMPT_ID wxT("Nyquist Prompt")
 #define NYQUIST_WORKER_ID wxT("Nyquist Worker")
 
 enum NyqControlType