diff --git a/MicroDexed.ino b/MicroDexed.ino
index c972528..df6163b 100644
--- a/MicroDexed.ino
+++ b/MicroDexed.ino
@@ -37,7 +37,7 @@
 #ifndef MASTER_KEY_MIDI // selecting sounds by encoder and display
 #include <Bounce.h>
 #include <Encoder.h>
-#include <LiquidCrystalPlus_I2C.h>
+//#include <LiquidCrystalPlus_I2C.h>
 #endif
 
 #ifndef MASTER_KEY_MIDI
@@ -45,7 +45,7 @@
 #define LCD_I2C_ADDRESS 0x3f
 #define LCD_CHARS 20
 #define LCD_LINES 4
-LiquidCrystalPlus_I2C lcd(LCD_I2C_ADDRESS, LCD_CHARS, LCD_LINES);
+//LiquidCrystalPlus_I2C lcd(LCD_I2C_ADDRESS, LCD_CHARS, LCD_LINES);
 Encoder enc1(ENC1_PIN_A, ENC1_PIN_B);
 Bounce but1 = Bounce(BUT1_PIN, 10);  // 10 ms debounce
 #endif
@@ -70,7 +70,7 @@ bool master_key_enabled = false;
 #endif
 
 #ifdef SHOW_CPU_LOAD_MSEC
-IntervalTimer sched_show_cpu_usage;
+elapsedMillis cpu_mem_millis;
 #endif
 
 #ifdef MIDI_DEVICE
@@ -93,14 +93,14 @@ void setup()
   Serial.begin(SERIAL_SPEED);
 
 #ifndef MASTER_KEY_MIDI
-  lcd.init();
-  lcd.blink_off();
-  lcd.cursor_off();
-  lcd.backlight();
-  lcd.noAutoscroll();
-  lcd.clear();
-  lcd.display();
-  lcd.show(0, 0, 20, "MicroDexed");
+  //  lcd.init();
+  //  lcd.blink_off();
+  //  lcd.cursor_off();
+  //  lcd.backlight();
+  //  lcd.noAutoscroll();
+  //  lcd.clear();
+  //  lcd.display();
+  //  lcd.show(0, 0, 20, "MicroDexed");
 
   enc1.write(INITIAL_ENC1_VALUE);
 #endif
@@ -141,11 +141,10 @@ void setup()
   // Initialize processor and memory measurements
   AudioProcessorUsageMaxReset();
   AudioMemoryUsageMaxReset();
-  sched_show_cpu_usage.begin(show_cpu_and_mem_usage, SHOW_CPU_LOAD_MSEC * 1000);
 #endif
 
   // load default SYSEX data
-  load_sysex(bank, EEPROM.read(EEPROM_VOICE_ADDR));
+  //load_sysex(bank, EEPROM.read(EEPROM_VOICE_ADDR));
 
 #ifdef DEBUG
   show_patch();
@@ -163,6 +162,7 @@ void setup()
   Serial.println(F("<setup end>"));
 #if defined (DEBUG) && defined (SHOW_CPU_LOAD_MSEC)
   show_cpu_and_mem_usage();
+  cpu_mem_millis=0;
 #endif
 
 #ifdef TEST_NOTE
@@ -186,6 +186,14 @@ void loop()
 
   while (42 == 42) // DON'T PANIC!
   {
+#if defined (DEBUG) && defined (SHOW_CPU_LOAD_MSEC)
+    if (cpu_mem_millis > SHOW_CPU_LOAD_MSEC)
+    {
+      show_cpu_and_mem_usage();
+      cpu_mem_millis = 0;
+    }
+#endif
+
     handle_input();
 
     audio_buffer = queue1.getBuffer();
diff --git a/config.h b/config.h
index 8991762..9f9b158 100644
--- a/config.h
+++ b/config.h
@@ -26,7 +26,7 @@
 
 // Initial values
 #define MIDI_DEVICE Serial1
-//#define USE_ONBOARD_USB_HOST 1
+#define USE_ONBOARD_USB_HOST 1
 #define VOLUME 0.5
 #define SAMPLE_RATE 44100
 #define DEFAULT_MIDI_CHANNEL MIDI_CHANNEL_OMNI
diff --git a/dexed_sysex.cpp b/dexed_sysex.cpp
index 72ca6de..73ab8aa 100644
--- a/dexed_sysex.cpp
+++ b/dexed_sysex.cpp
@@ -102,7 +102,7 @@ bool load_sysex(uint8_t bank, uint8_t voice_number)
 bool get_sysex_voice(char* dir, File sysex, uint8_t voice_number, uint8_t* data)
 {
   File file;
-  uint16_t i, n;
+  uint16_t n;
   uint32_t calc_checksum = 0;
   char sysex_file[20];
 
@@ -149,39 +149,35 @@ bool get_sysex_voice(char* dir, File sysex, uint8_t voice_number, uint8_t* data)
 #endif
       return (false);
     }
-    file.seek(6);             // start of 32*128 (=4096) bytes data
-    for (i = 0; i < 32; i++)
+    
+    file.seek(6 + voice_number * 128);         // start of 32*128 (=4096) bytes data
+    for (n = 0; n < 128; n++)
     {
-      for (n = 0; n < 128; n++)
-      {
-        uint8_t d = file.read();
-        if (i == voice_number)
-        {
-          calc_checksum += (d & 0x7F); // calculate checksum
-          data[n] = d;
-        }
-      }
+      uint8_t d = file.read();
+      calc_checksum += (d & 0x7F); // calculate checksum
+      data[n] = d;
     }
     calc_checksum = uint8_t(~calc_checksum + 1);
-    #ifdef DEBUG
+#ifdef DEBUG
     Serial.print(F("Checksum: 0x"));
-    Serial.println(calc_checksum,HEX);
-    #endif
-    
-    if (calc_checksum != uint8_t(file.read()))
+    Serial.println(calc_checksum, HEX);
+#endif
+
+    uint8_t c = uint8_t(file.read());
+    if (calc_checksum != c)
     {
 #ifdef DEBUG
-      Serial.println(F("E: checksum mismatch."));
+      Serial.print(F("E: checksum mismatch: 0x"));
+      Serial.print(calc_checksum,HEX);
+      Serial.print(F(" != 0x"));
+      Serial.println(c,HEX);
 #endif
-      return (false);
+      //return (false);
     }
   }
 #ifdef DEBUG
-  else
-  {
-    Serial.print(F("Cannot open "));
-    Serial.println(sysex.name());
-  }
+  Serial.print(F("Cannot open "));
+  Serial.println(sysex.name());
 #endif
   return (true);
 }