diff --git a/examples/USBH_MIDI/USB_MIDI_converter/USB_MIDI_converter.ino b/examples/USBH_MIDI/USB_MIDI_converter/USB_MIDI_converter.ino
index acd5fe10..1f5d1561 100644
--- a/examples/USBH_MIDI/USB_MIDI_converter/USB_MIDI_converter.ino
+++ b/examples/USBH_MIDI/USB_MIDI_converter/USB_MIDI_converter.ino
@@ -1,7 +1,7 @@
 /*
  *******************************************************************************
  * USB-MIDI to Legacy Serial MIDI converter
- * Copyright (C) 2012-2017 Yuuichi Akagawa
+ * Copyright (C) 2012-2020 Yuuichi Akagawa
  *
  * Idea from LPK25 USB-MIDI to Serial MIDI converter
  *   by Collin Cunningham - makezine.com, narbotic.com
@@ -24,6 +24,11 @@
 #else
 #define _MIDI_SERIAL_PORT Serial
 #endif
+
+// Set to 1 if you want to wait for the Serial MIDI transmission to complete.
+// For more information, see https://github.com/felis/USB_Host_Shield_2.0/issues/570
+#define ENABLE_MIDI_SERIAL_FLUSH 0
+
 //////////////////////////
 // MIDI Pin assign
 // 2 : GND
@@ -68,6 +73,9 @@ void MIDI_poll()
     if ( (size = Midi.RecvData(outBuf)) > 0 ) {
       //MIDI Output
       _MIDI_SERIAL_PORT.write(outBuf, size);
+#if ENABLE_MIDI_SERIAL_FLUSH
+      _MIDI_SERIAL_PORT.flush();
+#endif
     }
   } while (size > 0);
 }
diff --git a/examples/USBH_MIDI/USB_MIDI_converter_multi/USB_MIDI_converter_multi.ino b/examples/USBH_MIDI/USB_MIDI_converter_multi/USB_MIDI_converter_multi.ino
index c6a72e23..5c841a0c 100644
--- a/examples/USBH_MIDI/USB_MIDI_converter_multi/USB_MIDI_converter_multi.ino
+++ b/examples/USBH_MIDI/USB_MIDI_converter_multi/USB_MIDI_converter_multi.ino
@@ -1,7 +1,7 @@
 /*
  *******************************************************************************
  * USB-MIDI to Legacy Serial MIDI converter
- * Copyright (C) 2012-2017 Yuuichi Akagawa
+ * Copyright (C) 2012-2020 Yuuichi Akagawa
  *
  * Idea from LPK25 USB-MIDI to Serial MIDI converter
  *   by Collin Cunningham - makezine.com, narbotic.com
@@ -24,6 +24,11 @@
 #else
 #define _MIDI_SERIAL_PORT Serial
 #endif
+
+// Set to 1 if you want to wait for the Serial MIDI transmission to complete.
+// For more information, see https://github.com/felis/USB_Host_Shield_2.0/issues/570
+#define ENABLE_MIDI_SERIAL_FLUSH 0
+
 //////////////////////////
 // MIDI Pin assign
 // 2 : GND
@@ -73,6 +78,9 @@ void MIDI_poll(USBH_MIDI &Midi)
     if ( (size = Midi.RecvData(outBuf)) > 0 ) {
       //MIDI Output
       _MIDI_SERIAL_PORT.write(outBuf, size);
+#if ENABLE_MIDI_SERIAL_FLUSH
+      _MIDI_SERIAL_PORT.flush();
+#endif
     }
   } while (size > 0);
 }
diff --git a/examples/USBH_MIDI/bidirectional_converter/bidirectional_converter.ino b/examples/USBH_MIDI/bidirectional_converter/bidirectional_converter.ino
index 552cadf6..b752a05f 100644
--- a/examples/USBH_MIDI/bidirectional_converter/bidirectional_converter.ino
+++ b/examples/USBH_MIDI/bidirectional_converter/bidirectional_converter.ino
@@ -1,7 +1,7 @@
 /*
  *******************************************************************************
  * Legacy Serial MIDI and USB Host bidirectional converter
- * Copyright (C) 2013-2017 Yuuichi Akagawa
+ * Copyright (C) 2013-2020 Yuuichi Akagawa
  *
  * for use with Arduino MIDI library
  * https://github.com/FortySevenEffects/arduino_midi_library/
@@ -32,6 +32,10 @@ MIDI_CREATE_DEFAULT_INSTANCE();
 #define _MIDI_SERIAL_PORT Serial
 #endif
 
+// Set to 1 if you want to wait for the Serial MIDI transmission to complete.
+// For more information, see https://github.com/felis/USB_Host_Shield_2.0/issues/570
+#define ENABLE_MIDI_SERIAL_FLUSH 0
+
 //////////////////////////
 // MIDI Pin assign
 // 2 : GND
@@ -125,6 +129,9 @@ void MIDI_poll()
       _MIDI_SERIAL_PORT.write(outbuf, rc);
       p += 4;
     }
+#if ENABLE_MIDI_SERIAL_FLUSH
+      _MIDI_SERIAL_PORT.flush();
+#endif
     readPtr += 4;
   }
 #else
@@ -133,6 +140,9 @@ void MIDI_poll()
     if ( (size = Midi.RecvData(outBuf)) > 0 ) {
       //MIDI Output
       _MIDI_SERIAL_PORT.write(outBuf, size);
+#if ENABLE_MIDI_SERIAL_FLUSH
+      _MIDI_SERIAL_PORT.flush();
+#endif
     }
   } while (size > 0);
 #endif