diff --git a/firmware/src/main.cpp b/firmware/src/main.cpp
index 2f8fcdb..7bd9288 100644
--- a/firmware/src/main.cpp
+++ b/firmware/src/main.cpp
@@ -2,17 +2,39 @@
 #include <chrono>
 #include <cinttypes>
 
+#define u8 uint8_t
+#define u16 uint16_t
+#define u32 uint32_t
 #define u64 uint64_t
 #define timeMillis() std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count()
 #define min(a, b) ((a) < (b) ? (a) : (b))
 
 u64 start_time = 0;
 
-const int NUM_SENSORS = 2;
-int pins[] = {34, 39};   // GPIO34
-int notes[] = {84, 86};  // C6, D6
-int lasts[NUM_SENSORS];  // variable to store the value coming from the sensor
-u64 last_hit_times[NUM_SENSORS];
+typedef struct note {
+    char name[4];
+    u16 midi;
+} Note;
+
+
+// 61 Notes from C2 to C7
+const int NUM_NOTES = 61;
+
+const Note notes[] = {
+    {"C2", 36}, {"C#2", 37}, {"D2", 38}, {"D#2", 39}, {"E2", 40}, {"F2", 41}, {"F#2", 42}, {"G2", 43}, {"G#2", 44}, {"A2", 45}, {"A#2", 46}, {"B2", 47},
+    {"C3", 48}, {"C#3", 49}, {"D3", 50}, {"D#3", 51}, {"E3", 52}, {"F3", 53}, {"F#3", 54}, {"G3", 55}, {"G#3", 56}, {"A3", 57}, {"A#3", 58}, {"B3", 59},
+    {"C4", 60}, {"C#4", 61}, {"D4", 62}, {"D#4", 63}, {"E4", 64}, {"F4", 65}, {"F#4", 66}, {"G4", 67}, {"G#4", 68}, {"A4", 69}, {"A#4", 70}, {"B4", 71},
+    {"C5", 72}, {"C#5", 73}, {"D5", 74}, {"D#5", 75}, {"E5", 76}, {"F5", 77}, {"F#5", 78}, {"G5", 79}, {"G#5", 80}, {"A5", 81}, {"A#5", 82}, {"B5", 83},
+    {"C6", 84}, {"C#6", 85}, {"D6", 86}, {"D#6", 87}, {"E6", 88}, {"F6", 89}, {"F#6", 90}, {"G6", 91}, {"G#6", 92}, {"A6", 93}, {"A#6", 94}, {"B6", 95},
+    {"C7", 96}
+};
+
+// 4 Multiplexers: GPIO pins for each analog multiplexer that handles 16 sensors
+const int NUM_MUX = 4;
+const int mux[] = {35, 34, 36, 39};
+
+int lasts[NUM_NOTES];  // variable to store the value coming from the sensor
+u64 last_hit_times[NUM_NOTES];
 
 int max_sensor = 4096;
 int max_threshold = 700;