diff --git a/MicroDexed.ino b/MicroDexed.ino
index 49a284e..9ef338f 100644
--- a/MicroDexed.ino
+++ b/MicroDexed.ino
@@ -124,7 +124,7 @@ uint8_t effect_delay_volume = 0;
 bool effect_delay_sync = 0;
 elapsedMicros fill_audio_buffer;
 elapsedMillis control_rate;
-uint8_t shutdown_voices = 0;
+uint8_t active_voices = 0;
 
 #ifdef SHOW_CPU_LOAD_MSEC
 elapsedMillis cpu_mem_millis;
@@ -340,16 +340,8 @@ void loop()
   // Shutdown unused voices
   if (control_rate > CONTROL_RATE_MS)
   {
-    uint8_t tmp = shutdown_voices;
     control_rate = 0;
-    dexed->getNumNotesPlaying();
-
-    if (tmp != shutdown_voices)
-    {
-      Serial.print(F("Active voices ["));
-      Serial.print(shutdown_voices);
-      Serial.println(F("]"));
-    }
+    active_voices = dexed->getNumNotesPlaying();
   }
 
 #ifdef I2C_DISPLAY
@@ -954,6 +946,8 @@ void show_cpu_and_mem_usage(void)
   Serial.print(peak, DEC);
   Serial.print(F(" BLOCKSIZE: "));
   Serial.print(AUDIO_BLOCK_SAMPLES, DEC);
+  Serial.print(F(" ACTIVE_VOICES: "));
+  Serial.print(active_voices, DEC);
   Serial.println();
   AudioProcessorUsageMaxReset();
   AudioMemoryUsageMaxReset();
diff --git a/dexed.cpp b/dexed.cpp
index 1e09062..04965a2 100644
--- a/dexed.cpp
+++ b/dexed.cpp
@@ -395,7 +395,7 @@ uint8_t Dexed::getNumNotesPlaying(void)
 {
   uint8_t op_carrier = controllers.core->get_carrier_operators(data[134]); // look for carriers
   uint8_t i;
-  uint8_t count_playing_voices=0;
+  uint8_t count_playing_voices = 0;
 
   for (i = 0; i < max_notes; i++)
   {
@@ -405,19 +405,18 @@ uint8_t Dexed::getNumNotesPlaying(void)
       uint8_t op_carrier_num = 0;
 
       memset(&voiceStatus, 0, sizeof(VoiceStatus));
-
       voices[i].dx7_note->peekVoiceStatus(voiceStatus);
 
       for (uint8_t op = 0; op < 6; op++)
       {
-        if ((op_carrier & (1 >> op)) == 1)
+        if ((op_carrier & (1 << op)))
         {
+          // this voice is a carrier!
+          op_carrier_num++;
+          if (voiceStatus.amp[op] <= 1069 && voiceStatus.ampStep[op] == 4)
           {
-            // this voice is a carrier!
-            op_carrier_num++;
-
-            if (voiceStatus.amp[op] <= 1069 && voiceStatus.ampStep[op] == 4) // this voice produces no audio output
-              op_amp++;
+            // this voice produces no audio output
+            op_amp++;
           }
         }
       }
@@ -428,14 +427,16 @@ uint8_t Dexed::getNumNotesPlaying(void)
         voices[i].live = false;
         voices[i].sustained = false;
         voices[i].keydown = false;
-        Serial.print(F("Voice shutdown: "));
+#ifdef DEBUG
+        Serial.print(F("Shutdown voice: "));
         Serial.println(i, DEC);
+#endif
       }
       else
         count_playing_voices++;
     }
   }
-  return(count_playing_voices);
+  return (count_playing_voices);
 }
 
 bool Dexed::loadSysexVoice(uint8_t* new_data)