diff --git a/midi2cv/midi2cv.cc b/midi2cv/midi2cv.cc
index 057d150..0db43b4 100644
--- a/midi2cv/midi2cv.cc
+++ b/midi2cv/midi2cv.cc
@@ -4,6 +4,7 @@
 #include "drivers/gpio.h"
 #include "stmlib/system/system_clock.h"
 #include "ui.h"
+#include "part.h"
 
 using namespace stmlib;
 
diff --git a/midi2cv/part.cc b/midi2cv/part.cc
new file mode 100644
index 0000000..e69de29
diff --git a/midi2cv/part.h b/midi2cv/part.h
new file mode 100644
index 0000000..0d11071
--- /dev/null
+++ b/midi2cv/part.h
@@ -0,0 +1,54 @@
+#ifndef MIDI2CV_PART_H
+#define MIDI2CV_PART_H
+
+enum MIDIThruMode { OFF,
+  ON,
+  POLYCHAIN };
+
+enum BiOutputMode {
+  PITCH_UNI,
+  PITCH_BI,
+  SAW,
+  SQUARE,
+  SINE,
+  TRI
+};
+
+enum UniOutputMode {
+  PITCH,
+  VELOCITY,
+  AFTERTOUCH
+};
+
+enum GateOutputMode {
+  GATE,
+  TRIGGER
+};
+
+class Part {
+  public:
+  Part()
+      : voice_count(1)
+      , midi_filter_channel_enabled(true)
+      , midi_filter_channel(1)
+      , midi_thru_mode(OFF)
+      , output_mode_0(PITCH_UNI)
+      , output_mode_1(VELOCITY)
+      , output_mode_2(AFTERTOUCH)
+      , output_mode_3(GATE)
+  {
+  }
+  void ProcessMidiInput(/* TODO: Inputs */);
+
+  private:
+  uint8_t voice_count;
+  bool midi_filter_channel_enabled;
+  uint8_t midi_filter_channel;
+  MIDIThruMode midi_thru_mode;
+  BiOutputMode output_mode_0;
+  UniOutputMode output_mode_1;
+  UniOutputMode output_mode_2;
+  GateOutputMode output_mode_3;
+};
+
+#endif