diff --git a/README.MD b/README.MD
index b512a9a..e1c34d1 100644
--- a/README.MD
+++ b/README.MD
@@ -1,9 +1,10 @@
-6hp multichannel clock utility designed to be low cost and DIY friendly.
+6hp multichannel eurorack clock and trigger utility designed to be low cost and DIY friendly.
 
 > It is like a "Pamela's 'very light' Workout" ;)
+>
 > —u/BBougre
 
-Features:
+### Features:
 - 24ppqn internal clock with master BPM
 - 6 output channels
 - Separate divider or multiplier per chennel (from /32 to x24)
@@ -13,10 +14,12 @@ Features:
 - All channel settings and bpm are saved on play/pause and recalled on power up
 - 2 external clock modes (24ppqn and beat)
 
-TODO:
+### TODO:
 - swing
-- settings (input mode, pulse length)
+- settings (pulse length, display timeout)
 - expanders with midi/tap tempo etc
 
+### Acknowlidgements
 Timer library available here
-https://github.com/PaulStoffregen/FlexiTimer2
\ No newline at end of file
+https://github.com/PaulStoffregen/FlexiTimer2
+
diff --git a/software/GToE/GToE.ino b/software/GToE/GToE.ino
index 5c1372d..e80bf54 100644
--- a/software/GToE/GToE.ino
+++ b/software/GToE/GToE.ino
@@ -23,7 +23,7 @@
 
 const int outsPins[6] = {6, 11, 7, 10, 8, 9};
 
-const int clockModes[18] = {-24, -16, -12, -8, -6, -4, -3, -2, 1, 2, 3, 4, 5, 6, 7, 8, 16, 32}; //positive - divide, negative - multiply, 0 - off
+const int clockModes[17] = {-24, -12, -8, -6, -4, -3, -2, 1, 2, 3, 4, 5, 6, 7, 8, 16, 32}; //positive - divide, negative - multiply, 0 - off
 
 unsigned int bpm = 130;
 
@@ -51,8 +51,6 @@ int playingModes[6]; //actual channel modes array updated from channels each bea
 unsigned int pulsePeriod;
 bool isPlaying = false;
 
-bool pulseCounted = false;
-
 unsigned int tickCount = 0;
 unsigned int pulseCount = 0;
 
@@ -74,7 +72,7 @@ unsigned long encPressedTime;
 unsigned long encReleasedTime;
 bool encPressRegistered;
 
-unsigned long lastInteractionTime;
+unsigned long lastInteractionTime; // used for display timeout
 
 Adafruit_SSD1306 display(128, 64, &Wire, -1);
 RotaryEncoder encoder(ENC_D1_PIN, ENC_D2_PIN, RotaryEncoder::LatchMode::TWO03);
@@ -112,7 +110,7 @@ void setup() {
   pinMode(START_STOP_BTN_PIN, INPUT_PULLUP);
   pinMode(START_STOP_BTN_PIN, ANALOGUE_INPUT_1_PIN);
   pinMode(INPUT_PIN, INPUT_PULLUP);
-  attachInterrupt(digitalPinToInterrupt(INPUT_PIN), externalClock, RISING);
+  attachInterrupt(digitalPinToInterrupt(INPUT_PIN), externalClock, FALLING);
 
   for (int i=0; i<6; i++) {
     pinMode(outsPins[i], OUTPUT);
@@ -149,29 +147,24 @@ void clock() {
   if (isPlaying) {
 
     // Action on each pulse
-    if (tickCount == 0 && !pulseCounted) {
+    if (tickCount == 0 && masterClockMode == 0) {
       sendTriggers();
-      pulseCounted = true;
     }
 
     //this part gets the Pulse and Ticks ticking
     //it's placed after the triggers to avoid problems on the start (when pulseCount==0)
-    if (tickCount < pulsePeriod) {
-      tickCount++;
-    } else {
-      tickCount = 0;
-      if (pulseCount < (PPQN-1)) { //-1 is here to avoid extra IF to reset to 0
-        pulseCount++;
-      } else {
-        pulseCount = 0;
-      } 
+    tickCount++;
+    if (masterClockMode == 0) {
+      if (tickCount == pulsePeriod) {
+        tickCount = 0;
+        if (pulseCount < (PPQN-1)) { //-1 is here to avoid extra IF to reset to 0
+          pulseCount++;
+        } else {
+          pulseCount = 0;
+        } 
+      }
     }
 
-    //pulse and beat count reset
-    if (tickCount == 0) {
-      pulseCounted = false;
-    } 
-
     // pull low all outputs after set pulse length
     if (tickCount >= PULSE_LENGTH) {
       for (int i = 0; i<6; i++) { 
@@ -182,12 +175,27 @@ void clock() {
   }
 }
 
+void externalClock() {
+  externalPulseCounted = false;
+  lastExtPulseTime = newExtPulseTime;
+  newExtPulseTime = millis();
+  if (masterClockMode == 1) {
+    isPlaying = true;
+    sendTriggers();
+    tickCount = 0;
+    if (pulseCount < (PPQN-1)) {
+      pulseCount++;
+    } else {
+      pulseCount = 0;
+    } 
+  }
+}
+
 void sendTriggers() {
   //switching modes on the beat and resetting channel clock
   if (pulseCount == 0) {
     for (int i = 0; i<6; i++) {
       if (playingModes[i] != clockModes[channels[i].mode]) {
-        //playingModes[i] = clockModes[channels[i].mode];
         calculateCycles();
         channelPulseCount[i] = 0;
       }
@@ -220,10 +228,6 @@ void calculateCycles() {
   }
 }
 
-void externalClock() {
-  externalPulseCounted = false;
-}
-
 void updateTiming() {
   if (masterClockMode == 0) {
     pulsePeriod = 60000 / (bpm * PPQN);
@@ -335,8 +339,8 @@ void checkInputs() {
 
   //play button
   if (!digitalRead(START_STOP_BTN_PIN) && !playBtnPushed) {
-    isPlaying = !isPlaying;
     resetClocks();
+    isPlaying = !isPlaying;
     playBtnPushed = true;
     saveState();
     updateScreen(); //to wake up the screen if turned off