diff --git a/master/master/lib/afsk.c b/master/master/lib/afsk.c
--- a/master/master/lib/afsk.c
+++ b/master/master/lib/afsk.c
@@ -87,11 +87,14 @@ volatile const uint8_t *afsk_packet;
 void afsk_ptt_off() 
 {
 	// turn ptt off
+	PORTA &= ~(1<<PA5);
 }
 
 void afsk_ptt_on() 
 {
 	// turn the ptt on... possibly delay based on spec
+	PORTA |= (1<<PA5);
+	_delay_ms(5); // from datasheet
 }
 
 ISR(TIMER2_OVF_vect) 
@@ -140,7 +143,7 @@ ISR(TIMER2_OVF_vect)
 
 void afsk_output_sample(uint8_t s) 
 {
-	OCR2B = s;
+	OCR2A = s;
 }
 
 void afsk_timer_start()
@@ -157,7 +160,7 @@ void afsk_timer_stop()
 {
 	// Resting duty cycle
 	// Output 0v (could be 255/2, which is 0v after coupling... doesn't really matter)
-	OCR2B = 0x80;
+	OCR2A = 0x80;
 
 	// Disable playback interrupt
 	TIMSK2 &= ~_BV(TOIE2);
@@ -206,10 +209,8 @@ void afsk_setup()
 	TCCR2A |= _BV(WGM21) | _BV(WGM20);
 	TCCR2B &= ~_BV(WGM22);
 
-	// Do non-inverting PWM on pin OC2B (arduino pin 3) (p.159).
-	// OC2A (arduino pin 11) stays in normal port operation:
-	// COM2B1=1, COM2B0=0, COM2A1=0, COM2A0=0
-	TCCR2A = (TCCR2A | _BV(COM2B1)) & ~(_BV(COM2B0) | _BV(COM2A1) | _BV(COM2A0));
+	// Do non-inverting PWM on pin OC2A
+	TCCR2A = (TCCR2A | _BV(COM2A1)) & ~(_BV(COM2A0) | _BV(COM2B1) | _BV(COM2B0));
 
 	// No prescaler (p.162)
 	TCCR2B = (TCCR2B & ~(_BV(CS22) | _BV(CS21))) | _BV(CS20);
@@ -218,6 +219,7 @@ void afsk_setup()
 	//TIMSK2 |= _BV(TOIE2);
 	TIMSK2 |= 0b00000001;
 	
+	// FIXME TODO
 	DDRD = 0xff;
 	PORTD = 0xff;
 	
diff --git a/master/master/lib/led.c b/master/master/lib/led.c
--- a/master/master/lib/led.c
+++ b/master/master/lib/led.c
@@ -15,14 +15,13 @@
 #include <util/delay.h>
 #include "led.h"
 
-
+// Configure port direction and initial state of LEDs
 void led_setup() 
 {
 	for(int i=0; i<NUM_LEDS; i++)  {
 		*(ledList[i].direction) |= (1<<ledList[i].pin); // set pin to output
 		*(ledList[i].port) &= ~(1<<ledList[i].pin); // set pin low
 	}
-	
 }
 
 // Turn the specified LED on
@@ -37,8 +36,6 @@ void led_off(uint8_t led)
 	*(ledList[led].direction) &= ~(1<<ledList[led].pin);
 }
 
-
-
 // Flashes error LED a set amount of times, then leaves it on
 void led_errorcode(uint8_t code) 
 {