This version wasn't so broken.

pma770.ino

@@ -20,26 +20,36 @@ void updateShiftRegister()
 }
 void setTape2()
 {
+  out = 0;
+  updateShiftRegister();
   bitSet(out,5);
   updateShiftRegister();
 }
 void setTape1()
 {
+  out = 0;
+  updateShiftRegister();
   bitSet(out,4);
   updateShiftRegister();
 }
 void setAUX()
 {
+  out = 0;
+  updateShiftRegister();
   bitSet(out,3);
   updateShiftRegister();
 }
 void setTune()
 {
+  out = 0;
+  updateShiftRegister();
   bitSet(out,2);
   updateShiftRegister();
 }
 void setPh1()
 {
+  out = 0;
+  updateShiftRegister();
   bitSet(out,1);
   updateShiftRegister();
 }
@@ -49,26 +59,22 @@ void setup()
   pinMode(latchPin, OUTPUT);
   pinMode(dataPin, OUTPUT);  
   pinMode(clockPin, OUTPUT);
-  Serial.begin(9600);
-  Serial.print("Setting default output");
-  bitSet(out,7);
+// Serial.begin(9600);
+// Serial.print("Setting default output");
+  bitSet(out,6);
  updateShiftRegister();
- Serial.print("Scanning Matrix");
+// Serial.print("Scanning Matrix");
 }
 
 void loop() {
   // put your main code here, to run repeatedly:
 int mx = analogRead(matrix);
-  if (mx > '100' && mx < '200')
-    {setTape2();}
-  if (mx > '500' && mx < '600')
-    {setTape1();}
-  if (mx > '900' && mx < '950')
-    {setAUX();}
-  if (mx > '1000')
-    {setTune();}
-  if (mx > '820' && mx < '899')
-    {setPh1();}
-Serial.println(mx);
+  if (mx > 100 && mx < 200) setTape2();
+  if (mx > 500 && mx < 600) setTape1();
+  if (mx > 900 && mx < 950) setAUX();
+  if (mx > 1000) setTune();
+  if (mx > 820 && mx < 899) setPh1();
+
+// Serial.println(mx);
 delay(200);
 }