diff --git a/Config.h b/Config.h
index 0362cf7..f7b8d62 100644
--- a/Config.h
+++ b/Config.h
@@ -56,4 +56,7 @@
 // Enable P25 Wide modulation:
 // #define ENABLE_P25_WIDE
 
+// Disable mode LEDs blink during scan mode:
+// #define QUIET_MODE_LEDS
+
 #endif
diff --git a/IO.cpp b/IO.cpp
index 13ad169..f94ea4f 100644
--- a/IO.cpp
+++ b/IO.cpp
@@ -145,7 +145,9 @@ void CIO::process()
     m_modeTimerCnt = 0;
     if( (m_modemState == STATE_IDLE) && (m_scanPauseCnt == 0) && m_scanEnable) {
       m_scanPos = (m_scanPos + 1) % m_TotalModes;
+      #if !defined(QUIET_MODE_LEDS)
       setMode(m_Modes[m_scanPos]);
+      #endif
       io.ifConf(m_Modes[m_scanPos], true);
     }
   }
@@ -293,6 +295,11 @@ void CIO::setDecode(bool dcd)
   m_dcd = dcd;
 }
 
+void CIO::setLoDevYSF(bool on)
+{
+  m_LoDevYSF = on;
+}
+
 void CIO::resetWatchdog()
 {
   m_watchdog = 0U;
diff --git a/configs/ZUMspot_Libre.h b/configs/ZUMspot_Libre.h
index 0362cf7..f7b8d62 100644
--- a/configs/ZUMspot_Libre.h
+++ b/configs/ZUMspot_Libre.h
@@ -56,4 +56,7 @@
 // Enable P25 Wide modulation:
 // #define ENABLE_P25_WIDE
 
+// Disable mode LEDs blink during scan mode:
+// #define QUIET_MODE_LEDS
+
 #endif
diff --git a/configs/ZUMspot_RPi.h b/configs/ZUMspot_RPi.h
index dca35c0..0d26f22 100644
--- a/configs/ZUMspot_RPi.h
+++ b/configs/ZUMspot_RPi.h
@@ -56,4 +56,7 @@
 // Enable P25 Wide modulation:
 // #define ENABLE_P25_WIDE
 
+// Disable mode LEDs blink during scan mode:
+// #define QUIET_MODE_LEDS
+
 #endif
diff --git a/configs/ZUMspot_USB.h b/configs/ZUMspot_USB.h
index 3d124a6..41b9d26 100644
--- a/configs/ZUMspot_USB.h
+++ b/configs/ZUMspot_USB.h
@@ -56,4 +56,7 @@
 // Enable P25 Wide modulation:
 // #define ENABLE_P25_WIDE
 
+// Disable mode LEDs blink during scan mode:
+// #define QUIET_MODE_LEDS
+
 #endif
diff --git a/configs/ZUMspot_duplex.h b/configs/ZUMspot_duplex.h
index 3e81e9c..86a234f 100644
--- a/configs/ZUMspot_duplex.h
+++ b/configs/ZUMspot_duplex.h
@@ -56,4 +56,7 @@
 // Enable P25 Wide modulation:
 // #define ENABLE_P25_WIDE
 
+// Disable mode LEDs blink during scan mode:
+// #define QUIET_MODE_LEDS
+
 #endif