diff --git a/include/main.h b/include/main.h
index 5c3fddd..e3c1cdc 100644
--- a/include/main.h
+++ b/include/main.h
@@ -1,6 +1,7 @@
 #ifndef _MAIN
 #define _MAIN
 
+
 void lect();
 
 #endif
diff --git a/include/sound4calc.h b/include/sound4calc.h
index dee04af..41e5198 100644
--- a/include/sound4calc.h
+++ b/include/sound4calc.h
@@ -18,7 +18,8 @@
 #define	SH7337_PGDR 0xA400012C
 #define	SH7337_SCPDR 0xA4000136
 
-void SwitchPinState(char level);
+
+void PutPinState(char level);
 void PlayNote();
 void InitPorts();
 
diff --git a/src/main.c b/src/main.c
index 8d1ddcd..11e6be5 100644
--- a/src/main.c
+++ b/src/main.c
@@ -13,7 +13,7 @@ unsigned char range = 0;
 
 void lect()
 {
-  SwitchPinState(bincod[range]=='-');
+  PutPinState(bincod[range]=='-');
   range++;
   if(!(bincod[range])) range=0;
 }
diff --git a/src/sound4calc.c b/src/sound4calc.c
index 47966a0..e15cfd1 100644
--- a/src/sound4calc.c
+++ b/src/sound4calc.c
@@ -2,13 +2,58 @@
 #include <mpu.h> // from Gint
 #include <timer.h> //from Gint
 
-unsigned char* signal = {"----_____"};
+char* signal = "-_"; // simple waveform
+short Seq_signal[6] = {440,500,392,500,349,500}; // sequence signal
+
+
+void PlaySequence()
+{
+static int length_end = 0;
+static int note = 0;
+
+if(length_end<=0)
+  {
+  note+=2;
+
+  if(!Seq_signal[note])
+    {
+      timer_stop(TIMER_USER);
+      return;
+    }
+
+  length_end = Seq_signal[note+1];
+
+  timer_start(TIMER_USER, Seq_signal[note], Clock_Hz, PlaySequence, Seq_signal[note+1]);
+  }
+
+PlayNote();
+length_end--;
+}
 
 /*
-  SwitchPinState()
-  put the pin at the level
+  PlayNote()
+  allow to make different waveforms with '-' and '_'
 */
-void SwitchPinState(char level)
+void PlayNote()
+{
+static int x = 0;
+PutPinState(signal[x]=='-');
+x = x + 1;
+if(!(signal[x])) x = 0;
+}
+
+/*
+  PutPinState()
+  put the pin at the level wanted
+
+  SH4 :
+    state 0 : xxxx.01xx
+    state 1 : xxxx.10xx
+  SH3 :
+    state 0 : xxxx.xxx0
+    state 1 : xxxx.xxx1
+*/
+void PutPinState(char level)
 {
 level = !!level;
 
@@ -22,28 +67,18 @@ else
   }
 }
 
-/*
-  PlayNote()
-  allow to make different waveforms with '-' and '_'
-*/
-void PlayNote()
-{
-static x = 0;
-SwitchPinState(signal[x]=='-');
-x = x + 1;
-if(!(signal[x])) x = 0;
-}
 
 /*
   InitPorts();
-  Init ports to output
+  Ports initialisation
+  Open all need ports to use SwitchPinState()
 */
 void InitPorts()
 {
 if(isSH3())
   {
 // initialisation of pin
-  *(volatile unsigned char*)SH7337_SCPDR |= 0x01;
+//  *(volatile unsigned char*)SH7337_SCPDR |= 0x01;
 
 // SCIF2 clock on (STBCR3.MSTP31)
   *(volatile unsigned char*)SH7337_STBCR3 &= ~0x02;
@@ -61,7 +96,7 @@ if(isSH3())
 else
   {
 // initialisation of pin
-  *(volatile unsigned char*)SH7305_PJDR |= 0x04;
+//  *(volatile unsigned char*)SH7305_PJDR |= 0x04;
 
 // SCIF2 clock on (MSTPCR0.MSTP007)
   *(volatile unsigned int*)SH7305_MSTPCR0 &= ~0x00000080;
@@ -69,20 +104,20 @@ else
   *(volatile unsigned short*)SH7305_SCSCR &= ~0x0030;
   // SCIF2 clock off (MSTPCR0.MSTP007)
   *(volatile unsigned int*)SH7305_MSTPCR0 |= 0x00000080;
-
 // set bit 3 of port U to output mode
   *(volatile unsigned short*)SH7305_PUCR = ( *(volatile unsigned short*)SH7305_PUCR & ~0x00C0 ) | 0x0040;
 // set bit 4 and 5 of port U
   *(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;
+*/
   }
-    /*
-    // 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;*/
 }