a patch for @sampler stability + speaker idle noise malfunction issue

+ just don't give it message w/ note == 0. that breaks audio loop. and 
don't reach actual player.stop()

@sampler/src/main.cpp

@@ -112,6 +112,11 @@ void sample_player_start() {
   delay(10);
 }
 void sample_player_stop() {
+  //if note == 0, just stop immediately w/o checking
+  // + and this way of checking is not nice (AudioNoInterrupts + test + AudioInterrupts)
+  //   what if sound files list could be generated @ setup time and later just react on that list?
+  //   i think that way is much more stable than stopping interrupts. (-> breaks audio engine sometimes.)
+  if (note != 0) {
     //filename buffer - 8.3 naming convension! 8+1+3+1 = 13
     char filename[13] = "NNN.WAV";
     //search for the sound file
@@ -130,6 +135,7 @@ void sample_player_stop() {
       Serial.println("... does not exist.");
       return;
     }
+  }
   //stop the player.
   if (playSdWav1.isPlaying() == true) {
     playSdWav1.stop();