               }
               else
               {
+                untztrument.clrLED(untztrument.xy2i(7, visible_grid_set));
                 visible_grid_set = y;
                 untztrument.setLED(i);
               }

    mode = PLAYING_ERASE_C_1;
    refresh      = true;
  }

  // adjust the note offset here so all notes are off when we make the change
  temp = eDisplayOffset.getValue() / 4;
  diff = display_offset - temp;
  if (diff != 0)
  {
    display_offset = temp;

// add flicker to UI display indicators to vertical and horizontal bars so they are distict from the notes
// add flicker from notes on other layers when playing notes, maybe not as much as the tanori
// add computer generated music or accompiment
// add blutooth audio output
// support less than 8 wide grid when scrolling and disable keys on right side
// add a playlist to play complete song based on layer sets, requires measures to have the same width
// need to properly restore volumes, instruments, tempo, etc. when switching sets and layers
