diff --git a/projekte/protothreads/example.c b/projekte/protothreads/example.c
index 2d70b34..39c3a1a 100644
--- a/projekte/protothreads/example.c
+++ b/projekte/protothreads/example.c
@@ -7,7 +7,7 @@
 #include "clock.h"
 #include "timer.h"
 
-/* TIMER_DELAY macro for convenience */
+/* TIMER_DELAY macro for convenience, do { } while(0) is just a macro trick */
 #define TIMER_DELAY(pt, timer, t) \
   do { \
   timer_set(&timer, t); \
diff --git a/projekte/soundz/arpeggio/arpeggio.pde b/projekte/soundz/arpeggio/arpeggio.pde
index 6ceb64a..862d18b 100644
--- a/projekte/soundz/arpeggio/arpeggio.pde
+++ b/projekte/soundz/arpeggio/arpeggio.pde
@@ -93,12 +93,12 @@ void arpeggio_play(int32_t note, uint32_t len) {
   // clock tick is 1s/18.2 == 54ms
   #define MAGIC_CLOCK_TICK 54
   #define MAGIC_DELAY_FACTOR 400 // well, should be 1000 us?!
-  #define MAGIC_BREATH 50
   _delay_us(MAGIC_DELAY_FACTOR*(len*MAGIC_CLOCK_TICK/10));
     
   // breath
   curNote=REST;
-  _delay_us(50);
+  #define MAGIC_BREATH 50
+  _delay_us(MAGIC_BREATH);
 }
   
 void arpeggio(int32_t n1, int32_t n2, int32_t n3, int32_t len) { 
diff --git a/projekte/soundz/quak/quak.pde b/projekte/soundz/quak/quak.pde
new file mode 100644
index 0000000..b9000ed
--- /dev/null
+++ b/projekte/soundz/quak/quak.pde
@@ -0,0 +1,53 @@
+byte foo;
+int bar;
+byte mul;
+byte cnt;
+float wow;
+boolean b;
+int inv;
+
+#define WOW_FACTOR 512
+#define WOW_LIMIT 4
+
+void setup() {
+    pinMode(8, OUTPUT);
+    cnt = 0;
+    mul = 1;
+    wow = WOW_FACTOR;
+    inv = 1;
+}
+
+
+
+void loop() {
+  
+  if( cnt == 0 ) {
+    mul = random(6)+1;
+    cnt = 25;
+  }
+  
+  cnt--;
+  
+  foo = random(5*mul)+2;
+  
+  for(bar = 0; bar < (255-(foo*20)); bar++) {
+    
+    
+    if( inv == 1 )
+      wow /= 2;
+    else
+      wow *= 2;
+      
+    if( wow < WOW_LIMIT || wow > WOW_FACTOR ) {
+      inv = inv == 1 ? -1 : 1;
+    }
+    
+    digitalWrite(8, b = !b);
+    delayMicroseconds((WOW_FACTOR+(wow*inv))*foo+(bar*2*b));
+    
+    // NOISE
+    if( random(10) == 0 ) {
+      digitalWrite(8, b = !b); delayMicroseconds(4500); digitalWrite(8, b = !b);
+    } 
+  }
+}