diff --git a/src/WVR.h b/src/WVR.h
index 5b68b95..8e7fc24 100644
--- a/src/WVR.h
+++ b/src/WVR.h
@@ -8,6 +8,7 @@
 
 #include "Arduino.h"
 
+
 class WVR {
     public:
         WVR();
diff --git a/src/file_system.c b/src/file_system.c
index 6ebd51c..aea9cb0 100644
--- a/src/file_system.c
+++ b/src/file_system.c
@@ -1068,7 +1068,10 @@ size_t get_website_chunk(size_t start_block, size_t toWrite, uint8_t *buffer, si
 
 void updateVoiceConfig(char *json){
     feedLoopWDT();
-    cJSON *vc_json = cJSON_Parse(json);
+    const cJSON *vc_json = cJSON_Parse(json);
+    if(vc_json == NULL){
+        log_i("voice json too big :(");
+    }
     feedLoopWDT();
     cJSON *voice = NULL;
     cJSON *note = NULL;
@@ -1099,6 +1102,7 @@ void updateVoiceConfig(char *json){
                 if(voice_data[num_note].isRack > -1)
                 {
                     // this is a non-rack overwritting a former rack
+                    log_i("deleting rack %d", voice_data[num_note].isRack);
                     clear_rack(voice_data[num_note].isRack);
                     voice_data[num_note].isRack = -1;
                 }
diff --git a/src/pot.h b/src/pot.h
index 2204ff4..a6660d1 100644
--- a/src/pot.h
+++ b/src/pot.h
@@ -1,9 +1,15 @@
 #ifndef POT_H
 #define POT_H
+#ifdef __cplusplus 
+    extern "C" {
+#endif
 
 // #include "Arduino.h"
 
 void (* onPot)(uint32_t);
 void pot_init(void);
 
+#ifdef __cplusplus
+    }
+#endif
 #endif
\ No newline at end of file