diff --git a/Software/Gravity/Interactions.ino b/Software/Gravity/Interactions.ino
index 0a7a7ab..bb5b59d 100644
--- a/Software/Gravity/Interactions.ino
+++ b/Software/Gravity/Interactions.ino
@@ -168,6 +168,10 @@ void checkInputs() {
                  && (shiftBtnPushed || menuItemSelected)
                  && displayTab == 0 
                  && menuItem == 1) { //Master Clock Mode
+        if (masterClockMode == 1 && change == -1) { //Stop when switching from ext to int
+          isPlaying = false;
+        }
+        
         masterClockMode = masterClockMode + change;
         if (masterClockMode > 100) {
           masterClockMode = 0;