diff --git a/Out.cpp b/Out.cpp
index 03b7310..f32f9b4 100644
--- a/Out.cpp
+++ b/Out.cpp
@@ -7,46 +7,30 @@ Out::Out(byte pin) {
   this->pin = pin;
   state = LOW;
 
-	divideMode = 1;
-	modifier = 1;
-	div = 1;
-	divString = "";
-	cycle = 0;
+	divideMode = 1; // 1 divison | 0 multiplication
+	modifier = 1; // divide mode modifier (4x, /32, etc)
+	div = 1; // cycles needed before a pulse based on divide mode and modifier
+	cycle = 0; // how many cycles have passed since last pulse
+	divString = ""; // string for screen .. probably does not belong here
 
-	dur = 0;
-	width = 50;
-	// this needs to dynamically change with width
+	dur = 0; // how long pulse is on
+	width = 50; // pulse width
+	len = 0; // max len a pulse can be on, as determined by width
+
+	p = 100; // probability of a pulse
 
-	len = 0;
 
   pinMode(pin, OUTPUT);
 }
 
+int Out::getState() {
+	return state;
+}
+
 void Out::setLen(unsigned long currentPeriod) {
 	len = (unsigned long)((double)currentPeriod * (width / 100.0) / 1000.0);
 }
 
-void Out::turnOn() {
-	cycle += 1;
-	if (cycle == div) {
-		state = HIGH;
-
-		digitalWrite(pin, state);
-		dur = millis();
-
-		cycle = 0;
-	};
-}
-
-void Out::turnOff() {
-	
-	if (state == HIGH && millis() - dur >= len) {
-		state = LOW;
-		digitalWrite(pin, state);
-		dur = 0;
-	};
-}
-
 void Out::setDiv(int modifier, byte divide = 1) {
 	if (divide == 1) {
 		div = ppqn * modifier;
@@ -60,20 +44,45 @@ void Out::setDiv(int modifier, byte divide = 1) {
 };
 
 void Out::setWidth(int newWidth) {
-	Serial.println(modifier);
-	Serial.println(divideMode);
 	width = newWidth;
 	if (divideMode == 1) {
 		len = (unsigned long)((double)(minute / BPM) * (width / 100.0) / 1000.0);
 	} else {
 		len = (unsigned long)((double)(minute / BPM / modifier) * (width / 100.0) / 1000.0);
 	}
-	Serial.println(len);
-
-	Serial.println("=========");
 };
 
-int Out::getState() {
-	return state;
+void Out::setP(int prob) {
+	this->p = prob;
+}
+
+void Out::turnOn() {
+	cycle += 1;
+	byte pRes = 1;
+
+	if (cycle == div) {
+		Serial.println(p);
+		if (p < 100) {
+			long r = random(1, 101);
+			if (r > p) {
+				pRes = 0;
+			}
+		} 
+
+		if (pRes == 1) {
+			state = HIGH;
+			digitalWrite(pin, state);
+			dur = millis();
+		}
+		cycle = 0;
+	};
+}
+
+void Out::turnOff() {
+	if (state == HIGH && millis() - dur >= len) {
+		state = LOW;
+		digitalWrite(pin, state);
+		dur = 0;
+	};
 }
 
diff --git a/Out.h b/Out.h
index 0df40ff..c5e3833 100644
--- a/Out.h
+++ b/Out.h
@@ -16,6 +16,7 @@ class Out {
 		int div;
 		int modifier;
 		String divString;
+		int p;
 
   public:
     Out(byte pin);
@@ -24,6 +25,7 @@ class Out {
     void setLen(unsigned long currentPeriod);
     void setDiv(int newDiv, byte divide = 1);
     void setWidth(int newWidth);
+    void setP(int prob);
     int getState();
 
 };
diff --git a/globals.h b/globals.h
index 5a25180..b83e73e 100644
--- a/globals.h
+++ b/globals.h
@@ -13,9 +13,9 @@ extern byte ppqn;
 TODO:
 
 PRE-DAC:
-[ ] Figure out multiplicative beats X2 X4 X8 X16 X32?
+[x] Figure out multiplicative beats X2 X4 X8 X16 X32?
 [ ] Swing/Phase (same thing)
-[ ] Probability
+[x] Probability
 [ ] Humanization
 [ ] Euclidian Rhythms
   [ ] Steps - # of steps for a full pattern