     unsigned long lightStartUpTime = 0; // millis() the operations light started
   #endif
   const byte infoLedPin     = 5;       // the pin to which the operation led is connected to
-  boolean lightOn           = true;    // if true, the operations light fader is active. is set to false via a button, or after a maxLightTime (see below) is reached
+  boolean lightOn           = true;    // if true, the operations light fader is active. switched via a button, 
+                                       // set to false after a maxLightTime (in case of OPRLIGHTTIME) is reached
 #endif
 const byte warnLedPin       = 8;       // the pin to which the warning led is connected to
 const byte errorLedPin      = 9;       // the pin to which the error led is connected to



// iterates through al files in an album directory and calls playTrack for each track number iteratively
static char playAlbum(byte numberOfFiles) {
  boolean loopWarningMessageFileNotFound = true;// make sure   file not found               warning message is shown at least once
  
  #ifdef DEBUG

      }
    } else {  // we may start playing as it seems
      // now let's get the number of files in the album directory
      const char numberOfFiles = countFiles(SD.open(plrCurrentFolder));
      
      // there is no file in the folder indicate this as a minor error
      if (numberOfFiles < 1) {
