diff --git a/midi2cv/drivers/display.h b/midi2cv/drivers/display.h
index 9ecee24..e19f419 100644
--- a/midi2cv/drivers/display.h
+++ b/midi2cv/drivers/display.h
@@ -5,6 +5,9 @@
 #include <stm32f37x_conf.h>
 #include <u8g2.h>
 
+#define DISPLAY_WIDTH 128
+#define DISPLAY_HEIGHT 64
+
 class Display {
 public:
     Display() {}
diff --git a/midi2cv/midi2cv.cc b/midi2cv/midi2cv.cc
index 03dd69a..aedca29 100644
--- a/midi2cv/midi2cv.cc
+++ b/midi2cv/midi2cv.cc
@@ -12,7 +12,7 @@ GPIO gpio;
 Display display;
 UI ui;
 //SystemClock system_clock;
-Part part[4];
+Part part[PART_COUNT];
 
 // Default interrupt handlers.
 extern "C" {
diff --git a/midi2cv/part.h b/midi2cv/part.h
index b93715d..21dc04e 100644
--- a/midi2cv/part.h
+++ b/midi2cv/part.h
@@ -1,11 +1,15 @@
 #ifndef MIDI2CV_PART_H
 #define MIDI2CV_PART_H
 
-enum MIDIThruMode { OFF,
-  ON,
-  POLYCHAIN };
+#define PART_COUNT 4
 
-enum BiOutputType {
+#define TOTAL_COLUMN_COUNT 4
+
+typedef enum { MIDI_THRU_OFF,
+  MIDI_THRU_ON,
+  MIDI_THRU_POLYCHAIN } MIDIThruMode_t;
+
+typedef enum {
   BI_OFF = 0,
   BI_PITCH_UNI,
   BI_PITCH_BI,
@@ -13,9 +17,9 @@ enum BiOutputType {
   BI_SQUARE,
   BI_SINE,
   BI_TRIANGLE
-};
+} BiOutputType_t;
 
-enum UniOutputType {
+typedef enum {
   UNI_OFF = 0,
   UNI_PITCH,
   UNI_VELOCITY,
@@ -24,26 +28,40 @@ enum UniOutputType {
   UNI_BREATH,
   UNI_EXP,
   UNI_GATE
-};
+} UniOutputType_t;
 
-enum GateOutputType {
+typedef enum {
   GATE_OFF = 0,
   GATE_GATE,
   GATE_TRIGGER
-};
+} GateOutputType_t;
+
+typedef enum {
+  VOICE_COUNT_1 = 1,
+  VOICE_COUNT_2 = 2,
+  VOICE_COUNT_3 = 3,
+  VOICE_COUNT_4 = 4
+} PartVoiceCount_t;
+
+typedef enum {
+  VOICE_DETAIL_S,
+  VOICE_DETAIL_M,
+  VOICE_DETAIL_L,
+  VOICE_DETAIL_XL
+} PartVoiceDetail_t;
 
 class Part {
   public:
   Part()
-      : poly_voice_count(1)
-      , output_column_count(1)
+      : 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(OFF)
+      , midi_thru_mode(MIDI_THRU_OFF)
   {
-    for (int i = 0; i < 4; i++) {
+    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;
@@ -52,18 +70,22 @@ class Part {
   }
   void ProcessMidiInput(/* TODO: Inputs */);
 
+  uint8_t RequiredColumns();
+
   private:
-  uint8_t poly_voice_count;
-  uint8_t output_column_count;
+  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;
-  MIDIThruMode midi_thru_mode;
-  BiOutputType output_type_row_0[4];
-  UniOutputType output_type_row_1[4];
-  UniOutputType output_type_row_2[4];
-  GateOutputType output_type_row_3[4];
+  MIDIThruMode_t midi_thru_mode;
+  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];
 };
 
+extern Part parts[];
+
 #endif
diff --git a/midi2cv/ui.cc b/midi2cv/ui.cc
index 8643b15..8c6d9f8 100644
--- a/midi2cv/ui.cc
+++ b/midi2cv/ui.cc
@@ -1,36 +1,53 @@
 #include "ui.h"
 #include "drivers/display.h"
+#include "part.h"
 #include "stmlib/utils/random.h"
 #include <u8g2.h>
+
 using namespace stmlib;
 
+#define HEADER_HEIGHT 16
+
+const char part_names[4][2] = { "A", "B", "C", "D" };
+
 void UI::Update()
 {
-    u8g2_t* u8g2_ = display.u8g2();
-    static float x = 0, y = 16, dx = 1, dy = 1, ddx = .2, ddy = .2;
-    u8g2_ClearBuffer(u8g2_);
-    u8g2_SetFont(u8g2_, u8g2_font_6x10_mf);
-    u8g2_DrawStr(u8g2_, (int)x, (int)y, "send nudes");
-    x += dx * ddx;
-    y += dy * ddy;
-    if (x >= 70 || x <= 0) {
-	ddx = Random::GetFloat() / 4.0 + 0.1;
-    }
-    if (x >= 70)
-	dx = -1;
-    if (x <= 0)
-	dx = 1;
-    if (y >= 64 || y <= 7) {
-	ddy = Random::GetFloat() / 4.0 + 0.1;
-    }
-    if (y >= 64)
-	dy = -1;
-    if (y <= 7)
-	dy = 1;
-    display.Swap();
+
+  switch (current_menu) {
+  case MENU_PART_1:
+  case MENU_PART_2:
+  case MENU_PART_3:
+  case MENU_PART_4:
+    DrawHeader();
+    DrawPartMenu(current_menu);
+    break;
+  default:
+
+    break;
+  }
+}
+
+void UI::DrawHeader()
+{
+  for (int i = 0; i < PART_COUNT; i++) {
+    u8g2_SetFontMode(display.u8g2(), 1);
+    u8g2_SetDrawColor(display.u8g2(), 1);
+    if (current_menu == i)
+      u8g2_DrawBox(display.u8g2(), i * (DISPLAY_WIDTH / PART_COUNT), 0, (DISPLAY_WIDTH / PART_COUNT), HEADER_HEIGHT);
+    else
+      u8g2_DrawFrame(display.u8g2(), i * (DISPLAY_WIDTH / PART_COUNT), 0, (DISPLAY_WIDTH / PART_COUNT), HEADER_HEIGHT);
+
+    u8g2_SetDrawColor(display.u8g2(), 2);
+    u8g2_DrawStr(display.u8g2(), i * (DISPLAY_WIDTH / PART_COUNT) + 2, 2, part_names[i]);
+    u8g2_SetDrawColor(display.u8g2(), 1);
+  }
+}
+
+void UI::DrawPartMenu(Menu_t menu)
+{
 }
 
 void UI::Flush()
 {
-    display.Flush();
+  display.Flush();
 }
diff --git a/midi2cv/ui.h b/midi2cv/ui.h
index 351cd5d..8b37947 100644
--- a/midi2cv/ui.h
+++ b/midi2cv/ui.h
@@ -3,16 +3,29 @@
 
 #include "stmlib/stmlib.h"
 
+typedef enum {
+  MENU_PART_1,
+  MENU_PART_2,
+  MENU_PART_3,
+  MENU_PART_4,
+  MENU_COUNT
+} Menu_t;
+
 class UI {
-public:
-    UI() {}
-    ~UI() {}
+  public:
+  UI() {}
+  ~UI() {}
 
-    void Update();
-    void Flush();
+  void Update();
+  void Flush();
 
-private:
-    DISALLOW_COPY_AND_ASSIGN(UI);
+  private:
+  Menu_t current_menu;
+
+  void DrawHeader();
+  void DrawPartMenu(Menu_t menu);
+
+  DISALLOW_COPY_AND_ASSIGN(UI);
 };
 
 extern UI ui;