diff --git a/src/main.c b/src/main.c
index 39487dd..6ad48db 100644
--- a/src/main.c
+++ b/src/main.c
@@ -6,7 +6,7 @@
 #include "string.h"
 //#define PI 3.141592653584
 
-void DrawKeyF(unsigned char* str, unsigned char keyF)
+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);
@@ -16,30 +16,29 @@ int main(void)
 {
     unsigned int key = 0;
     unsigned short place = 0;
-  //unsigned int i=0;
 
-  note.freq = 440;
-  note.wave.signal[0] = 0;
-  note.duration = 2000;
+// initialisation to play
+    note.freq = 440;
+    note.wave.signal[0] = 0;
+    note.duration = 2000;
 
     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", place);
-        dprint(1, 30, "F1:note/F2:sequence");
+        dprint(1, 20, "%d", note.wave.length);
 
         DrawKeyF("not", 1);
         DrawKeyF("seq", 2);
         DrawKeyF("_", 5);
         DrawKeyF("-", 6);
 
-        note.wave.length = place;
-
         dupdate();
 
         key = getkey();
@@ -58,9 +57,7 @@ int main(void)
             case KEY_F1 : CallNote(); break;
             case KEY_F2 : CallSequence(); break;
 
-            case KEY_EXIT :
-                StopTimer();
-                    return 1;
+            case KEY_EXIT : StopTimer(); return 1;
         }
     }
     return 1; // this point is never reached
diff --git a/src/sound4calc.c b/src/sound4calc.c
index e0a2bfa..2aa5db1 100644
--- a/src/sound4calc.c
+++ b/src/sound4calc.c
@@ -2,16 +2,14 @@
 #include <mpu.h> // from Gint
 #include <timer.h> //from Gint
 
-static int strlen(char* str);
-
 static struct {
    	int freq;
     int length_ms;
   } seq[] = {
-      {  440,  1000 },
-      {  392,  1000 },
-      {  349,  1000 },
-      {   -1,   -1 }
+      {  440,  500  },
+      {  392,  500  },
+      {  349,  1000  },
+      {   -1,   -1  },
   };
 
 struct Note note;
@@ -48,6 +46,10 @@ void CallSequence()
     seq_length--;
 }
 
+/*
+    CallNote();
+    Create a single sound
+*/
 void CallNote()
 {
     timer_start(TIMER_USER, note.freq * note.wave.length, Clock_Hz, PlayNote, note.wave.length * note.freq * note.duration / 1000);
@@ -110,9 +112,6 @@ void InitPorts()
 {
     if(isSH3())
     {
-// initialisation of pin
-//  *(volatile unsigned char*)SH7337_SCPDR |= 0x01;
-
 // SCIF2 clock on (STBCR3.MSTP31)
         *(volatile unsigned char*)SH7337_STBCR3 &= ~0x02;
 // switch off SCSMR_2.TE and SCSMR_2.RE
@@ -128,9 +127,6 @@ void InitPorts()
     }
     else
     {
-// initialisation of pin
-//  *(volatile unsigned char*)SH7305_PJDR |= 0x04;
-
 // SCIF2 clock on (MSTPCR0.MSTP007)
         *(volatile unsigned int*)SH7305_MSTPCR0 &= ~0x00000080;
 // switch off SCSMR_2.TE and SCSMR_2.RE
@@ -154,14 +150,3 @@ void InitPorts()
 */
     }
 }
-
-/*
-    Strings functions
-*/
-
-static int strlen(char *str)
-{
-    int i = 0;
-    while(*str++) i++;
-    return i;
-}