diff --git a/MicroDexed.ino b/MicroDexed.ino
index 1b0cadf..c18ba36 100644
--- a/MicroDexed.ino
+++ b/MicroDexed.ino
@@ -129,8 +129,11 @@ void create_audio_connections(AudioSourceMicroDexed &d)
   dynamicConnections[nDynamic++] = new AudioConnection(d, 0 , master_mixer_l, 0);
 #if defined(USE_REVERB)
   dynamicConnections[nDynamic++] = new AudioConnection(d, 0, freeverbs1, 0);
-  dynamicConnections[nDynamic++] = new AudioConnection(d, 0, freeverbs1, 1);
 #endif
+  for (int i = 0; i < nDynamic; i++) {
+    if (dynamicConnections[i] == NULL)
+      Serial.printf ("Bad connection %d\n", i);
+  }
 }
 
 bool sd_card_available = false;
@@ -160,7 +163,7 @@ config_t configuration;
 uint8_t selected_dexed_instance = 0;
 
 // Allocate the delay lines for chorus
-short delayline[MOD_DELAY_SAMPLE_BUFFER];
+int16_t delayline[MOD_DELAY_SAMPLE_BUFFER];
 
 #ifdef ENABLE_LCD_UI
 /***********************************************************************
@@ -209,6 +212,9 @@ void setup()
     Serial.print(F("Creating MicroDexed engine "));
     Serial.println(i, DEC);
     MicroDexed[i] = new AudioSourceMicroDexed(SAMPLE_RATE);
+    if (MicroDexed[i] == NULL) {
+          Serial.print(F("Unable to create MicroDexed engine!"));
+    }
     create_audio_connections(*MicroDexed[i]);
   }
 
@@ -312,7 +318,7 @@ void setup()
   change_disp_sd(true);
 #endif
   // Init effects
-  memset(delayline, 0, MOD_DELAY_SAMPLE_BUFFER);
+  memset(delayline, 0, sizeof(delayline));
   if (!modchorus.begin(delayline, MOD_DELAY_SAMPLE_BUFFER)) {
     Serial.println(F("AudioEffectModulatedDelay - begin failed"));
     while (1);