diff --git a/clock.h b/clock.h
index 44eac80..2a0e54b 100644
--- a/clock.h
+++ b/clock.h
@@ -46,7 +46,6 @@ class Clock {
         pinMode(PULSE_OUT_PIN, OUTPUT);
 
         // Initialize the clock library
-        uClock.setExtIntervalBuffer(32);
         uClock.init();
         uClock.setClockMode(uClock.INTERNAL_CLOCK);
         uClock.setOutputPPQN(uClock.PPQN_96);
diff --git a/examples/clock_mod/clock_mod.ino b/examples/clock_mod/clock_mod.ino
index e2823be..0474477 100644
--- a/examples/clock_mod/clock_mod.ino
+++ b/examples/clock_mod/clock_mod.ino
@@ -293,7 +293,12 @@ void DisplayMainPage() {
     if (app.selected_param == 0) {
         gravity.display.setFont(LARGE_FONT);
         char num_str[3];
-        sprintf(num_str, "%d", gravity.clock.Tempo());
+        // Serial MIID is too unstable to display bpm in real time.
+        if (app.selected_source == SOURCE_EXTERNAL_MIDI) {
+            sprintf(num_str, "%s", "EXT");
+        } else {
+            sprintf(num_str, "%d", gravity.clock.Tempo());
+        }
         textWidth = gravity.display.getUTF8Width(num_str);
         gravity.display.drawStr(32 - (textWidth / 2), textY, num_str);
         gravity.display.setFont(TEXT_FONT);