diff --git a/include/sound4calc.h b/include/sound4calc.h
index 48a452e..7d44e4c 100644
--- a/include/sound4calc.h
+++ b/include/sound4calc.h
@@ -3,7 +3,7 @@
 
 struct Wave
 {
-    char signal[25];
+    unsigned short signal;
     unsigned short length;
 };
 
diff --git a/src/main.c b/src/main.c
index 6ad48db..7010417 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,46 +1,46 @@
 #include "main.h"
 #include "sound4calc.h"
-#include <timer.h>
+
 #include <display.h>
 #include <keyboard.h>
 #include "string.h"
 //#define PI 3.141592653584
 
-void DrawKeyF(char* str, unsigned char keyF)
-{
-    dprint((keyF-1)*22 + 8 - 2*strlen(str), 55, "%s", str);
-    dreverse_area((keyF-1)*22 - 2 , 54, keyF * 21, 64);
-}
-
 int main(void)
 {
     unsigned int key = 0;
     unsigned short place = 0;
+    unsigned char str[16];
 
 // initialisation to play
     note.freq = 440;
-    note.wave.signal[0] = 0;
+    note.wave.signal = 0;
     note.duration = 2000;
 
+    note.wave.length = 16; // 2 bytes long
+
     InitPorts();
 
     while(1)
     {
-        note.wave.length = place;
-
         dclear();
 
-        dprint(1, 1, "%d", note.freq);
-        dprint(1, 10, "%s", note.wave.signal);
-        dprint(1, 20, "%d", note.wave.length);
+        dprint(1, 1, "frq = %d", note.freq);
+        dprint(1, 10, "%s", str);
+        dprint(1, 20, "%d", note.wave.signal);
+        dprint(1, 30, "%d", place);
+        dprint(1, 40, "length %d", note.wave.length);
 
         DrawKeyF("not", 1);
         DrawKeyF("seq", 2);
-        DrawKeyF("_", 5);
-        DrawKeyF("-", 6);
+        DrawKeyF("1", 5);
+        DrawKeyF("0", 6);
 
         dupdate();
 
+        str[place] = 0;
+        note.wave.signal = atob(str, note.wave.length);
+
         key = getkey();
 
         switch(key)
@@ -50,9 +50,13 @@ int main(void)
             case KEY_UP : note.freq+=10; break;
             case KEY_DOWN : note.freq-=10; break;
 
-            case KEY_F5 : *(note.wave.signal+place++) = '_'; *(note.wave.signal+place) = 0; break;
-            case KEY_F6 : *(note.wave.signal+place++) = '-'; *(note.wave.signal+place) = 0; break;
-            case KEY_DEL : place=(place>0 ? place - 1 : 0); *(note.wave.signal+place) = 0; break;
+            case KEY_F5 : str[place] = '1'; place=(place < note.wave.signal ? place + 1 : place); break;
+            case KEY_F6 : str[place] = '0'; place=(place < note.wave.signal ? place + 1 : place); break;
+            case KEY_DEL : place=(place>0 ? place - 1 : 0);  break;
+
+            //case KEY_F5 : *(note.wave.signal+place++) = 255; *(note.wave.signal+place) = 0; break;
+            //case KEY_F6 : *(note.wave.signal+place++) = 240; *(note.wave.signal+place) = 0; break;
+            //case KEY_DEL : place=(place>0 ? place - 1 : 0); *(note.wave.signal+place) = 0; break;
 
             case KEY_F1 : CallNote(); break;
             case KEY_F2 : CallSequence(); break;
@@ -62,3 +66,19 @@ int main(void)
     }
     return 1; // this point is never reached
 }
+
+void DrawKeyF(char* str, unsigned char keyF)
+{
+    dprint((keyF-1)*21 + 11 - 3*strlen(str), 55, "%s", str);
+    dreverse_area((keyF-1)*21 + 1 , 54, keyF * 21 - 1, 64);
+}
+
+int atob(unsigned char* str, int bit_nb)
+{
+    unsigned int tmp = 0;
+    for(int i = 0; i < bit_nb; i++)
+    {
+        tmp += ((str[i] - '0') * (0x1 << (bit_nb - i - 1)));
+    }
+    return tmp;
+}
diff --git a/src/sound4calc.c b/src/sound4calc.c
index 2aa5db1..007dcdf 100644
--- a/src/sound4calc.c
+++ b/src/sound4calc.c
@@ -8,7 +8,10 @@ static struct {
   } seq[] = {
       {  440,  500  },
       {  392,  500  },
-      {  349,  1000  },
+      {  349,  1000 },
+      {  262,  500  },
+      {  294,  500  },
+      {  262,  1000 },
       {   -1,   -1  },
   };
 
@@ -72,9 +75,12 @@ void PlayNote()
 {
     static int x = 0;
 
-    PutPinState(note.wave.signal[x]=='-');
+    PutPinState((note.wave.signal >> x) & 0x01);
     x = x + 1;
-    if(!(note.wave.signal[x])) x = 0;
+    if(x>=note.wave.length)
+    {
+        x = 0;
+    }
 }
 
 /*
@@ -82,8 +88,11 @@ void PlayNote()
     put the pin at the level wanted
 
     SH4 :
-        state 0 : xxxx.01xx
-        state 1 : xxxx.10xx
+        state 0 : xxxx.x0xx
+        state 1 : xxxx.x1xx
+
+        We can put 2 other state but the sound volume is too high
+
     SH3 :
         state 0 : xxxx.xxx0
         state 1 : xxxx.xxx1
@@ -98,7 +107,7 @@ void PutPinState(char level)
     }
     else
     {
-        *(volatile unsigned char*)SH7305_PJDR = (*(volatile unsigned char*)SH7305_PJDR & 0xF3) | (0x4 << level);
+        *(volatile unsigned char*)SH7305_PJDR = (*(volatile unsigned char*)SH7305_PJDR & 0xF3) | (0x2 << level);
     }
 }
 
@@ -139,14 +148,12 @@ void InitPorts()
         *(volatile unsigned char*)SH7305_PUDR |= 0x0C;
 // set port J bit 2 to output
         *(unsigned short*)0xA4050110 = ( *(unsigned short*)0xA4050110 & ~0x0030 ) | 0x0010;
+
 // set port J bit 3 to input
         *(unsigned short*)0xA4050110 = ( *(unsigned short*)0xA4050110 & ~0x00C0 ) | 0x0080;
 
-/*
-// set port J bit 2 to output mode
-  *(volatile unsigned short*)SH7305_PJCR = ( *(volatile unsigned short*)SH7305_PJCR & ~0x0030 ) | 0x0010;
 // set port J bit 3 to output mode
-  *(volatile unsigned short*)SH7305_PJCR = ( *(volatile unsigned short*)SH7305_PJCR & ~0x00C0 ) | 0x0040;
-*/
+        //*(volatile unsigned short*)SH7305_PJCR = ( *(volatile unsigned short*)SH7305_PJCR & ~0x00C0 ) | 0x0040;
+
     }
 }