diff --git a/midi2cv/midi2cv.cc b/midi2cv/midi2cv.cc
index 777e982..dbe7740 100644
--- a/midi2cv/midi2cv.cc
+++ b/midi2cv/midi2cv.cc
@@ -21,7 +21,7 @@ Settings settings;
 
 Part parts[PART_COUNT];
 Part* part_pointers[PART_COUNT] = { &parts[0], &parts[1], &parts[2], &parts[3] };
-UI ui(part_pointers);
+UI ui(part_pointers, &settings);
 
 // Default interrupt handlers.
 extern "C" {
diff --git a/midi2cv/part.h b/midi2cv/part.h
index 219575c..966041e 100644
--- a/midi2cv/part.h
+++ b/midi2cv/part.h
@@ -54,42 +54,39 @@ typedef enum : uint8_t {
   VOICE_DETAIL_XL = 3
 } PartVoiceDetail_t;
 
-class Part {
-  public:
-  Part()
-      : part_voice_count(VOICE_COUNT_1)
-      , part_voice_detail(VOICE_DETAIL_S)
-      , midi_filter_channel_enabled(true)
-      , midi_filter_channel(1)
-      , midi_filter_lowest_note(0)
-      , midi_filter_highest_note(127)
-      , midi_thru_mode(MIDI_THRU_OFF)
-  {
-    for (int i = 0; i < TOTAL_COLUMN_COUNT; i++) {
-      output_type_row_0[i] = BI_OFF;
-      output_type_row_1[i] = UNI_OFF;
-      output_type_row_2[i] = UNI_OFF;
-      output_type_row_3[i] = GATE_OFF;
-    }
-  }
-  void ProcessMidiInput(/* TODO: Inputs */);
-
-  uint8_t RequiredColumns();
-
-  PartVoiceCount_t part_voice_count;
-  PartVoiceDetail_t part_voice_detail;
-  bool midi_filter_channel_enabled;
-  uint8_t midi_filter_channel;
-  uint8_t midi_filter_lowest_note;
-  uint8_t midi_filter_highest_note;
-  MIDIInput_t midi_filter_input;
-  MIDIThruMode_t midi_thru_mode;
+struct PartData { // Everything defined here will be stored in flash even in power down
+  PartVoiceCount_t part_voice_count = VOICE_COUNT_1;
+  PartVoiceDetail_t part_voice_detail = VOICE_DETAIL_S;
+  bool midi_filter_channel_enabled = true;
+  uint8_t midi_filter_channel = 1;
+  uint8_t midi_filter_lowest_note = 0;
+  uint8_t midi_filter_highest_note = 127;
+  MIDIInput_t midi_filter_input = MIDI_INPUT_OMNI;
+  MIDIThruMode_t midi_thru_mode = MIDI_THRU_OFF;
   BiOutputType_t output_type_row_0[TOTAL_COLUMN_COUNT];
   UniOutputType_t output_type_row_1[TOTAL_COLUMN_COUNT];
   UniOutputType_t output_type_row_2[TOTAL_COLUMN_COUNT];
   GateOutputType_t output_type_row_3[TOTAL_COLUMN_COUNT];
 };
 
+class Part {
+  public:
+  Part()
+  {
+    for (int i = 0; i < TOTAL_COLUMN_COUNT; i++) {
+      data.output_type_row_0[i] = BI_OFF;
+      data.output_type_row_1[i] = UNI_OFF;
+      data.output_type_row_2[i] = UNI_OFF;
+      data.output_type_row_3[i] = GATE_OFF;
+    }
+  }
+  void ProcessMidiInput(/* TODO: Inputs */);
+
+  uint8_t RequiredColumns();
+
+  PartData data;
+};
+
 extern Part parts[];
 
 #endif
diff --git a/midi2cv/settings.cc b/midi2cv/settings.cc
index a405480..68a77db 100644
--- a/midi2cv/settings.cc
+++ b/midi2cv/settings.cc
@@ -1,23 +1,11 @@
 #include "settings.h"
 #include "midi2cv/part.h"
 
-Settings::Settings()
+Settings::Settings() : first_start(false)
 {
   persistent_data_.honor = 1;
 
-  for (int i = 0; i < PART_COUNT; i++) {
-    PartState* part = &state_.part_states[i];
-
-    part->midi_filter_channel = 1;
-    part->midi_filter_channel_enabled = true;
-    part->midi_filter_lowest_note = 0;
-    part->midi_filter_highest_note = 127;
-    part->midi_filter_input = MIDI_INPUT_OMNI;
-    part->part_voice_count = VOICE_COUNT_1;
-    part->part_voice_detail = VOICE_DETAIL_S;
-  }
-
-  /*bool success =*/chunk_storage_.Init(&persistent_data_, &state_);
+  first_start = !chunk_storage_.Init(&persistent_data_, &state_);
 }
 
 void Settings::SavePersistentData()
diff --git a/midi2cv/settings.h b/midi2cv/settings.h
index fc4ce68..fb20b4b 100644
--- a/midi2cv/settings.h
+++ b/midi2cv/settings.h
@@ -7,23 +7,12 @@
 
 struct PersistentData {
   uint8_t honor;
-  uint8_t padding[15];
+  uint8_t padding[7];
   enum { tag = 0x494C4143 }; // CALI
 };
 
-struct PartState { // 8 bytes, TODO: can these be pointers to the actual values, or can we do some other copying magic?
-  PartVoiceCount_t part_voice_count;
-  PartVoiceDetail_t part_voice_detail;
-  uint8_t midi_filter_channel_enabled;
-  uint8_t midi_filter_channel;
-  uint8_t midi_filter_lowest_note;
-  uint8_t midi_filter_highest_note;
-  MIDIInput_t midi_filter_input;
-  MIDIThruMode_t midi_thru_mode;
-};
-
 struct State {
-  PartState part_states[PART_COUNT]; // 4 * 8 bytes
+  PartData part_datas[PART_COUNT];
   //uint8_t padding[4];
   enum { tag = 0x54415453 }; // STAT
 };
@@ -56,17 +45,22 @@ class Settings {
     return &state_;
   }
 
-  inline const PartState& part(int i) const
+  inline const PartData& part(int i) const
   {
-    return state_.part_states[i];
+    return state_.part_datas[i];
   }
 
-  inline PartState* mutable_part(int i)
+  inline PartData* mutable_part(int i)
   {
-    return &state_.part_states[i];
+    return &state_.part_datas[i];
+  }
+
+  inline bool is_first_start() {
+    return this->first_start;
   }
 
   private:
+  bool first_start;
   PersistentData persistent_data_;
   State state_;
 
@@ -79,5 +73,3 @@ class Settings {
 
   DISALLOW_COPY_AND_ASSIGN(Settings);
 };
-
-extern Settings settings;
diff --git a/midi2cv/ui.cc b/midi2cv/ui.cc
index 7627b90..f027d52 100644
--- a/midi2cv/ui.cc
+++ b/midi2cv/ui.cc
@@ -14,11 +14,12 @@ using namespace stmlib;
 
 const uint32_t kEncoderLongPressTime = 600;
 
-UI::UI(Part** part_pointers)
+UI::UI(Part** part_pointers, Settings* settings)
     : main_menu(part_pointers)
     , parts(part_pointers)
 {
   this->input_queue.Init();
+  this->settings = settings;
 
   LoadState();
 }
@@ -61,22 +62,17 @@ void UI::Draw()
 
 void UI::LoadState()
 {
-  for (size_t i = 0; i < PART_COUNT; i++) {
-    parts[i]->midi_filter_channel = settings.part(i).midi_filter_channel;
-    parts[i]->midi_filter_channel_enabled = settings.part(i).midi_filter_channel_enabled;
-    parts[i]->midi_filter_lowest_note = settings.part(i).midi_filter_lowest_note;
-  }
+  for(size_t i = 0; i < PART_COUNT; i++)
+    this->parts[i]->data = settings->part(i);
 }
 
 void UI::SaveState()
 {
   for (size_t i = 0; i < PART_COUNT; i++) {
-    settings.mutable_part(i)->midi_filter_channel = this->parts[i]->midi_filter_channel;
-    settings.mutable_part(i)->midi_filter_channel_enabled = this->parts[i]->midi_filter_channel_enabled;
-    settings.mutable_part(i)->midi_filter_lowest_note = this->parts[i]->midi_filter_lowest_note;
+    *(settings->mutable_part(i)) = this->parts[i]->data;
   }
 
-  settings.SaveState();
+  settings->SaveState();
 }
 
 void UI::Flush()
diff --git a/midi2cv/ui.h b/midi2cv/ui.h
index 1a4f463..b24c2d1 100644
--- a/midi2cv/ui.h
+++ b/midi2cv/ui.h
@@ -5,12 +5,13 @@
 #include "stmlib/ui/event_queue.h"
 
 #include "config.h"
+#include "settings.h"
 #include "ui/main_menu.h"
 #include <array>
 
 class UI {
   public:
-  UI(Part** part_pointers);
+  UI(Part** part_pointers, Settings* settings);
   ~UI() {}
 
   void Poll();
@@ -20,6 +21,8 @@ class UI {
   private:
   stmlib::EventQueue<16> input_queue;
 
+  Settings* settings;
+
   bool long_press_event_sent_;
   uint32_t start_stop_press_time_;
   bool encoder_long_press_event_sent_;
diff --git a/midi2cv/ui/part_menu.cc b/midi2cv/ui/part_menu.cc
index f15a681..cebb2e9 100644
--- a/midi2cv/ui/part_menu.cc
+++ b/midi2cv/ui/part_menu.cc
@@ -12,14 +12,14 @@ static const char* kMidiThruStrings[] = { "off", "on", "polychain" };
 
 PartMenu::PartMenu(Part* _part)
     : part(_part)
-    , item_voice_count("voice count", (uint8_t*)&_part->part_voice_count, 1, 4, 1)
-    , item_voice_detail("voice detail", (uint8_t*)&_part->part_voice_detail, kVoiceDetailStrings, 4)
-    , item_midi_filter_enabled("MIDI filter", &_part->midi_filter_channel_enabled, "on", "off")
-    , item_midi_channel("MIDI channel", (uint8_t*)&_part->midi_filter_channel, kMidiChannelStrings, 17)
-    , item_midi_input("MIDI input", (uint8_t*)&_part->midi_filter_input, kMidiInputStrings, 3)
-    , item_midi_lowest_note("MIDI lowest", (uint8_t*)&_part->midi_filter_lowest_note)
-    , item_midi_highest_note("MIDI highest", (uint8_t*)&_part->midi_filter_highest_note)
-    , item_midi_thru_mode("MIDI thru", (uint8_t*)&_part->midi_thru_mode, kMidiThruStrings, 3)
+    , item_voice_count("voice count", (uint8_t*)&_part->data.part_voice_count, 1, 4, 1)
+    , item_voice_detail("voice detail", (uint8_t*)&_part->data.part_voice_detail, kVoiceDetailStrings, 4)
+    , item_midi_filter_enabled("MIDI filter", &_part->data.midi_filter_channel_enabled, "on", "off")
+    , item_midi_channel("MIDI channel", (uint8_t*)&_part->data.midi_filter_channel, kMidiChannelStrings, 17)
+    , item_midi_input("MIDI input", (uint8_t*)&_part->data.midi_filter_input, kMidiInputStrings, 3)
+    , item_midi_lowest_note("MIDI lowest", (uint8_t*)&_part->data.midi_filter_lowest_note)
+    , item_midi_highest_note("MIDI highest", (uint8_t*)&_part->data.midi_filter_highest_note)
+    , item_midi_thru_mode("MIDI thru", (uint8_t*)&_part->data.midi_thru_mode, kMidiThruStrings, 3)
 {
   this->menu.add_item(&this->item_voice_count);
   this->menu.add_item(&this->item_voice_detail);