diff --git a/offok/offok.ino b/offok/offok.ino
index 70aa357..9d57648 100644
--- a/offok/offok.ino
+++ b/offok/offok.ino
@@ -5,12 +5,13 @@
 /*--------------------------------------------------------------*/
 /*
 This gets IR codes send by a TvBeGone & displays results on OLED
-02/14/21: First proof of IR sensor & Oled
-02/17/21: Moved to new lib U8g2lib, works OK on UNO
-04/05/21: OK on NANO
+02/14/21: First proof of IR sensor & Oled on UNO
+02/17/21: Updated to new lib U8g2lib, works OK on UNO
+04/05/21: works OK on NANO
 04/22/21: new logo, display hex code, test piezo OK
 05/19/21: added offok_tunes.h for rtttl libraries & ringtones
           logo.h renamed to offok_logo.h  
+10/08/21: enun t_tune for calls of play_r3tl for when SOUND is OFF            
 TODO: adjust parameters, use protothreads ?
 */
 #include <Arduino.h>
@@ -34,29 +35,46 @@ U8G2_SH1106_128X64_NONAME_1_HW_I2C u8g2\
 /* the function tone() uses timer2 by default, so does IRremote lib.
  * File IRremoteBoardDefs.h, in lib IRremote define wich timer to use */
 // #define IR_USE_TIMER1   // use Timer 1 instead of Timer 2
-const int RECV_PIN = 2;
+#define NBCODES 120        // min number of codes to qualify a kit
+#define ACQUINONE 3000     // no IR signal timeout in millisecond
+const int RECV_PIN = 2;    // IR receiver signal pin
 IRrecv irrecv(RECV_PIN);
 decode_results results;
 /*
  *  Sound settings
  */
-#define PIEZO  7         // Loudspeaker pin
+#define SOUND_ON        // comment if you can't stand the noise ! 
+enum t_tune {NoTone, Intro, CountOK, CountKO, GetIR }; 
+#ifdef SOUND_ON
+#define PIEZO  7          // Loudspeaker pin
 #include "offok_tunes.h" // predefined ringtones juke-box :-)
+#endif
 
 //#define DEBUG
-#define SOUND_ON        // comment if you can't stand  
-#define NBCODES 120     // min number of codes to qualify a kit
-#define ACQUINONE 4000  // no IR signal timeout in millisecond
 
 // ==================== Functions ====================
 void showTrace();         // defined after main ifdef DEBUG
 void showCount(int val) ; // defined after main not used anymore
 
-// play a rtttl ringtone definef in offok_tunes.h
-void play_r3tl (const char * rtune){
+// play a rtttl ringtone defined in offok_tunes.h
+void play_r3tl (t_tune itune){
+char * rtune;  
 #ifdef SOUND_ON
+  switch (itune) { // ugly code to manage SOUND off
+    case NoTone  : noTone(PIEZO);
+    return; 
+    case Intro   : rtune = _rIntro_ ;
+    break;
+    case CountOK : rtune = _rCountOK_ ;
+        break;
+    case CountKO : rtune = _rCountKO_ ;
+        break;
+    case GetIR   : rtune = _rGetIR_ ;
+        break;
+    default : rtune = _rCountOK2_;
+  }
   anyrtttl::blocking::play(PIEZO, rtune);
-#endif
+#endif // else: do nothing when ! SOUND_OFF
 }
 void drawLogo(void) {  // draw the logo screen
   u8g2.firstPage();
@@ -65,18 +83,18 @@ void drawLogo(void) {  // draw the logo screen
   } while ( u8g2.nextPage() );
 }
 // Oled brightness dimmer, slope up or down
-void constratSlope(int depart, int aim, int inc, int lag) {
+void contrastSlope(int depart, int aim, int inc, int lag) {
   int i=depart;
   // at first, if increasing then 
-  if (inc > 0) u8g2.setPowerSave(0); // disable oled
+  if (inc > 0) u8g2.setPowerSave(0); // disable oled 
   do {
-    i=constrain(i,0,254);
+    i=constrain(i,0,255);
     u8g2.setContrast(i); // 0 (no contrast) to 255
     delay (lag);
     i=i+inc;
   } while (i != aim);
   // at end, if decreasing then
-  if (inc < 0) u8g2.setPowerSave(0); // disable oled 
+  if (inc < 0) u8g2.clear(); // clear oled 
 }
 // & at the end ... the winner is
 void showResult(int val){
@@ -87,18 +105,18 @@ void showResult(int val){
     u8g2.setFont(u8g2_font_profont17_tr);
     u8g2.drawStr(10,24, "Total recus :");
     u8g2.setFont(u8g2_font_profont22_tr);
-    u8g2.drawStr(30,54, l1);
+    u8g2.drawStr(35,55, l1);
   } while ( u8g2.nextPage() );
   if (val > NBCODES)
-    play_r3tl(_rCountOK_);
+    play_r3tl(CountOK);
   else
-    play_r3tl(_rCountKO_);
-  noTone(PIEZO);
+    play_r3tl(CountKO);
+  play_r3tl(NoTone);
 }
 // display incoming IR frame code
 void showCode(unsigned long val) {
   char buf[16];
-  play_r3tl(_rGetIR_);
+  play_r3tl(GetIR);
   u8g2.firstPage();
   do {
     u8g2.setFont(u8g2_font_profont17_tr);
@@ -110,13 +128,15 @@ void showCode(unsigned long val) {
 }
 
 void setup(void) { 
-  noTone(PIEZO);
-  u8g2.begin(); 
-  drawLogo();
+  play_r3tl(NoTone);
+  u8g2.begin();
+  u8g2.clear(); 
 #ifdef DEBUG   
   Serial.begin(9600);
 #endif  
-  play_r3tl(_rIntro_);
+  play_r3tl(Intro);
+  drawLogo();
+  contrastSlope(0, 255, 1, 15);
   irrecv.enableIRIn(); // Start the receiver
   delay(1000); 
 }
@@ -125,7 +145,7 @@ void setup(void) {
 int cl=0; unsigned long lastReading=0, currentt=0;
 
 void loop(void) {
-  noTone(PIEZO);
+  play_r3tl(NoTone);
   if (irrecv.decode(&results)) { // if we keep getting signals, it is running
     lastReading=millis();
     cl += 1;
@@ -138,10 +158,10 @@ void loop(void) {
     if ((lastReading + ACQUINONE < currentt) && ( cl > 0)) { // lastReading too old
       showTrace();
       showResult(cl); cl = 0; 
-      constratSlope(255, 0, -1, 50);
-      delay(3000);
+      contrastSlope(255, 0, -1, 35); // fades results in ~ 9 sec
+      delay(1000);
       drawLogo(); 
-      constratSlope(0, 255, 1, 20);
+      contrastSlope(0, 255, 1, 15); // takes ~ 4 sec for logo to be full bright
     }
   }
 } // loop