diff --git a/README.md b/README.md
index 1e3ad70..237f38e 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,8 @@
 	- No need to change checkboxes, only paste the URL and hit OK.
 4. Install **Raspberry Pi Pico** boards ([HowTo install boards](https://support.arduino.cc/hc/en-us/articles/360016119519-Add-boards-to-Arduino-IDE))
 5. Install libraries ([HowTo install libraries](https://docs.arduino.cc/software/ide-v2/tutorials/ide-v2-installing-a-library/)): Adafruit Neopixel, AS5600 (Rob Tillaart), TCA9555 (Rob Tillaart)
-6. Choose **Generic RP2350** as board and the correct port
+6. Choose **Generic RP2350** as board and the correct port (Mac: /dev/cu.usbmodemXXXX, PC: COMXX Serial Port)
 7. Go to **Tools -> Flash Size** and choose **16MB (no FS)**
-8. Hit Upload Button
+8. Make your changes in the code
+9. Hit Upload Button (Arduino IDE compiles and uploads it automatically)
 
diff --git a/soundcube-firmware/soundcube-firmware.ino b/soundcube-firmware/soundcube-firmware.ino
index 693b52f..41331c5 100644
--- a/soundcube-firmware/soundcube-firmware.ino
+++ b/soundcube-firmware/soundcube-firmware.ino
@@ -124,10 +124,12 @@ void loop() {
   //   Serial.println(ENC.getRevolutions());
   // }
 
+  // LED Ring leeren
   for (int i = 0; i < 48; i++) {
     ui_pixels.setPixelColor(i + 3, edge_pixels.Color(0, 0, 0));
   }
 
+  // flag = true when a button is pushed
   if (flag) {
     int val = TCA.read16();
     Serial.println(val, BIN);
@@ -143,6 +145,7 @@ void loop() {
     if (HAPTIC) {
       digitalWrite(6, HIGH);
     }
+    // Make beep
     if (AURAL) {
       digitalWrite(7, HIGH);
       click = true;
@@ -150,19 +153,21 @@ void loop() {
       click = false;
       digitalWrite(7, LOW);
     }
+    // Make vibration
     if(HAPTIC){
       if(!AURAL) delay(50);
       digitalWrite(6, LOW);
     }
+    // Flash led ring 
     for (int i = 0; i < 48; i++) {
         ui_pixels.setPixelColor(i + 3, edge_pixels.Color(0, 15, 0));
     }
+    // Switch through LED matrix
     if(buttons[RIGHT]) active++;
     if(buttons[LEFT]) active--;
     if(active == 13) active = 0;
     if(active == -1) active = 12;
   }
-  // 11111110 11111111 button right
 
   // EDGE LEDs
   for (int i = 0; i < 8; i++) {
@@ -174,18 +179,22 @@ void loop() {
   ui_pixels.setPixelColor(1, edge_pixels.Color(0, 0, 15));
   ui_pixels.setPixelColor(2, edge_pixels.Color(0, 0, 15));
 
+  // empty LED matrix
   for (int i = 0; i < 13; i++) {
     ui_pixels.setPixelColor(i + 3 + 48 + 4, edge_pixels.Color(0, 0, 0));
   }
   
+  // set active LED matrix LED
   ui_pixels.setPixelColor(active + 3 + 48 + 4, edge_pixels.Color(255, 255, 255));
 
-  active_led_ring = abs((position / 256) % 48);
+  if(position < 0) position += 4096;
+  active_led_ring = (position / 32) % 48;
+  
+  // set active LED ring LED
   ui_pixels.setPixelColor(active_led_ring + 3, edge_pixels.Color(255, 255, 255));
-  // put your main code here, to run repeatedly:
 
-  edge_pixels.show();  // Set all pixel colors to 'off'
-  ui_pixels.show();    // Set all pixel colors to 'off'
+  edge_pixels.show();
+  ui_pixels.show();
 
-  delay(1);
+  delay(1); // wait 1ms
 }
\ No newline at end of file