 
     digitalWriteFast(channel_1_out, LOW);
     digitalWriteFast(channel_2_out, LOW);
-    
+    vfd.setCursor(0, 0);
+    vfd.print("      ESTOP     ");
     // Require HW reboot to exit
     while(true) {};
+
   }
 }
 

    init_mode("Pulse Mode");
    
    while (system_mode == 0) {
      read_controls();
      update_bottom_display_line();      


    init_mode("Pink Noise");
    int delay_time;
    while (system_mode == 4) {
      act_on_estop()
      read_controls();
      update_bottom_display_line();

