diff --git a/src/performanceconfig.cpp b/src/performanceconfig.cpp
index af36e8a..b7d967a 100644
--- a/src/performanceconfig.cpp
+++ b/src/performanceconfig.cpp
@@ -520,7 +520,8 @@ void CPerformanceConfig::SetReverbLevel (unsigned nValue)
 	m_nReverbLevel = nValue;
 }
 
-// Unison
+#ifdef ARM_ALLOW_MULTI_CORE
+/* Unison START */
 bool CPerformanceConfig::GetUnisonEnable (void) const
 {
 	return m_bUnisonEnable;
@@ -550,6 +551,8 @@ void CPerformanceConfig::SetUnisonDetuneSpread (unsigned nValue)
 {
 	m_nUnisonDetuneSpread = nValue;
 }
+/* Unison END */
+#endif
 
 // Pitch bender and portamento:
 void CPerformanceConfig::SetPitchBendRange (unsigned nValue, unsigned nTG)
diff --git a/src/performanceconfig.h b/src/performanceconfig.h
index 017c419..76aa768 100644
--- a/src/performanceconfig.h
+++ b/src/performanceconfig.h
@@ -117,13 +117,16 @@ public:
 	void SetReverbDiffusion (unsigned nValue);
 	void SetReverbLevel (unsigned nValue);
 
-	// Unison
+	#ifdef ARM_ALLOW_MULTI_CORE
+	/* Unison START */
 	bool GetUnisonEnable (void) const;
 	unsigned GetUnisonPanSpread (void) const;
 	unsigned GetUnisonDetuneSpread (void) const;
 	void SetUnisonEnable (bool bValue);
 	void SetUnisonPanSpread (unsigned nValue);
 	void SetUnisonDetuneSpread (unsigned nValue);
+	/* Unison END */
+	#endif
 
 	bool VoiceDataFilled(unsigned nTG);
 	bool ListPerformances();