diff --git a/src/tracker/SampleEditor.cpp b/src/tracker/SampleEditor.cpp
index 4624184b..792f36c9 100644
--- a/src/tracker/SampleEditor.cpp
+++ b/src/tracker/SampleEditor.cpp
@@ -3033,12 +3033,12 @@ void SampleEditor::tool_generateHalfSine(const FilterParameters* par)
 	const float amplify = par->getParameter(0).floatPart;
 
 	// generate half sine wave here
-	for (i = sStart; i < sEnd / 2; i++)
+	for (i = sStart; i < sStart + sLen / 2; i++)
 	{
 		float per = (i - sStart) / (float)sLen * numPeriods;
 		setFloatSampleInWaveform(i, (float)sin(per) * amplify);
 	}
-	for (i = sEnd / 2; i < sEnd; i++)
+	for (; i < sEnd; i++)
 	{
 		setFloatSampleInWaveform(i, 0);
 	}
@@ -3083,17 +3083,72 @@ void SampleEditor::tool_generateAbsoluteSine(const FilterParameters* par)
 	const float numPeriods = (float)(6.283185307179586476925286766559 * par->getParameter(1).floatPart);
 	const float amplify = par->getParameter(0).floatPart;
 
-	// generate half sine wave in first and second halves
-	for (i = sStart; i < sEnd / 2; i++)
+	// generate absolute sine wave here
+	for (i = sStart; i < sEnd; i++)
+	{
+		float per = (i - sStart) / (float)sLen * numPeriods;
+		setFloatSampleInWaveform(i, fabs((float)sin(per) * amplify));
+	}
+
+	finishUndo();
+
+	postFilter();
+}
+
+void SampleEditor::tool_generateQuarterSine(const FilterParameters* par)
+{
+	if (isEmptySample())
+		return;
+
+	pp_int32 sStart = selectionStart;
+	pp_int32 sEnd = selectionEnd;
+
+	if (hasValidSelection())
+	{
+		if (sStart >= 0 && sEnd >= 0)
+		{
+			if (sEnd < sStart)
+			{
+				pp_int32 s = sEnd; sEnd = sStart; sStart = s;
+			}
+		}
+	}
+	else
+	{
+		sStart = 0;
+		sEnd = sample->samplen;
+	}
+
+	preFilter(&SampleEditor::tool_generateQuarterSine, par);
+
+	mp_sint32 sLen = sEnd - sStart;
+
+	prepareUndo();
+
+	pp_int32 i;
+
+	const float numPeriods = (float)(6.283185307179586476925286766559 * par->getParameter(1).floatPart);
+	const float amplify = par->getParameter(0).floatPart;
+
+	// generate quarter sine wave in first and third quarters
+	for (i = sStart; i < sStart + sLen / 4; i++)
 	{
 		float per = (i - sStart) / (float)sLen * numPeriods;
 		setFloatSampleInWaveform(i, (float)sin(per) * amplify);
 	}
-	for (i = sEnd / 2; i < sEnd; i++)
+	for (; i < sStart + sLen / 2; i++)
 	{
-		float per = (i - sEnd / 2) / (float)sLen * numPeriods;
+		setFloatSampleInWaveform(i, 0);
+	}
+	for (; i < sStart + sLen * 3 / 4; i++)
+	{
+		float per = (i - (sStart + sLen / 2)) / (float)sLen * numPeriods;
 		setFloatSampleInWaveform(i, (float)sin(per) * amplify);
 	}
+	for (; i < sEnd; i++)
+	{
+		setFloatSampleInWaveform(i, 0);
+	}
 
 	finishUndo();
 
diff --git a/src/tracker/SampleEditor.h b/src/tracker/SampleEditor.h
index a516c967..8757eeff 100644
--- a/src/tracker/SampleEditor.h
+++ b/src/tracker/SampleEditor.h
@@ -357,6 +357,7 @@ class SampleEditor : public EditorBase
 	void tool_generateSawtooth(const FilterParameters* par);
 	void tool_generateHalfSine(const FilterParameters* par);
 	void tool_generateAbsoluteSine(const FilterParameters* par);
+	void tool_generateQuarterSine(const FilterParameters* par);
 
 	void tool_applyLastFilter();
 	bool tool_canApplyLastFilter() const;
diff --git a/src/tracker/SampleEditorControl.cpp b/src/tracker/SampleEditorControl.cpp
index de6d8bae..a6b6e407 100644
--- a/src/tracker/SampleEditorControl.cpp
+++ b/src/tracker/SampleEditorControl.cpp
@@ -162,6 +162,7 @@ SampleEditorControl::SampleEditorControl(pp_int32 id,
 	subMenuGenerators->addEntry("Sawtooth" PPSTR_PERIODS, MenuCommandIDGenerateSawtooth);
 	subMenuGenerators->addEntry("Half Sine" PPSTR_PERIODS, MenuCommandIDGenerateHalfSine);
 	subMenuGenerators->addEntry("Absolute Sine" PPSTR_PERIODS, MenuCommandIDGenerateAbsoluteSine);
+	subMenuGenerators->addEntry("Quarter Sine" PPSTR_PERIODS, MenuCommandIDGenerateQuarterSine);
 	subMenuGenerators->addEntry("Silence" PPSTR_PERIODS, MenuCommandIDGenerateSilence);
 	
 	// build context menu
@@ -1717,6 +1718,7 @@ void SampleEditorControl::invokeContextMenu(const PPPoint& p, bool translatePoin
 	subMenuGenerators->setState(MenuCommandIDGenerateSawtooth, isEmptySample);
 	subMenuGenerators->setState(MenuCommandIDGenerateHalfSine, isEmptySample);
 	subMenuGenerators->setState(MenuCommandIDGenerateAbsoluteSine, isEmptySample);
+	subMenuGenerators->setState(MenuCommandIDGenerateQuarterSine, isEmptySample);
 	subMenuGenerators->setState(MenuCommandIDGenerateSilence, isEmptySample);
 
 	parentScreen->setContextMenuControl(editMenuControl);
@@ -1907,6 +1909,10 @@ void SampleEditorControl::executeMenuCommand(pp_int32 commandId)
 			invokeToolParameterDialog(ToolHandlerResponder::SampleToolTypeGenerateAbsoluteSine);
 			break;
 
+		case MenuCommandIDGenerateQuarterSine:
+			invokeToolParameterDialog(ToolHandlerResponder::SampleToolTypeGenerateQuarterSine);
+			break;
+
 	}
 }
 
diff --git a/src/tracker/SampleEditorControl.h b/src/tracker/SampleEditorControl.h
index 570aabcc..9f9bd0bf 100644
--- a/src/tracker/SampleEditorControl.h
+++ b/src/tracker/SampleEditorControl.h
@@ -309,7 +309,8 @@ class SampleEditorControl : public PPControl, public EventListenerInterface, pub
 		MenuCommandIDGenerateTriangle,
 		MenuCommandIDGenerateSawtooth,
 		MenuCommandIDGenerateHalfSine,
-		MenuCommandIDGenerateAbsoluteSine
+		MenuCommandIDGenerateAbsoluteSine,
+		MenuCommandIDGenerateQuarterSine
 	};
 	
 	void executeMenuCommand(pp_int32 commandId);
@@ -355,7 +356,8 @@ class SampleEditorControl : public PPControl, public EventListenerInterface, pub
 			SampleToolTypeGenerateTriangle,
 			SampleToolTypeGenerateSawtooth,
 			SampleToolTypeGenerateHalfSine,
-			SampleToolTypeGenerateAbsoluteSine
+			SampleToolTypeGenerateAbsoluteSine,
+			SampleToolTypeGenerateQuarterSine
 		};
 	
 	private:
diff --git a/src/tracker/SampleEditorControlToolHandler.cpp b/src/tracker/SampleEditorControlToolHandler.cpp
index 675d0b55..62292600 100644
--- a/src/tracker/SampleEditorControlToolHandler.cpp
+++ b/src/tracker/SampleEditorControlToolHandler.cpp
@@ -155,6 +155,7 @@ bool SampleEditorControl::invokeToolParameterDialog(SampleEditorControl::ToolHan
 		case ToolHandlerResponder::SampleToolTypeGenerateSawtooth:
 		case ToolHandlerResponder::SampleToolTypeGenerateHalfSine:
 		case ToolHandlerResponder::SampleToolTypeGenerateAbsoluteSine:
+		case ToolHandlerResponder::SampleToolTypeGenerateQuarterSine:
 		{
 			dialog = new DialogWithValues(parentScreen, toolHandlerResponder, PP_DEFAULT_ID, "Generate waveform" PPSTR_PERIODS, DialogWithValues::ValueStyleEnterTwoValues);
 			static_cast<DialogWithValues*>(dialog)->setValueOneCaption("Volume in percent:");
@@ -358,6 +359,17 @@ bool SampleEditorControl::invokeTool(ToolHandlerResponder::SampleToolTypes type)
 			break;
 		}
 
+		case ToolHandlerResponder::SampleToolTypeGenerateQuarterSine:
+		{
+			lastValues.waveFormVolume = static_cast<DialogWithValues*>(dialog)->getValueOne();
+			lastValues.waveFormNumPeriods = static_cast<DialogWithValues*>(dialog)->getValueTwo();
+			FilterParameters par(2);
+			par.setParameter(0, FilterParameters::Parameter(lastValues.waveFormVolume / 100.0f));
+			par.setParameter(1, FilterParameters::Parameter(lastValues.waveFormNumPeriods));
+			sampleEditor->tool_generateQuarterSine(&par);
+			break;
+		}
+
 		default:
 			break;
 	}