     // initialize interface
     lfsr_loop_ = jack_1s_ = d_out_ = t_out_ = false;
     jack_d_ = jack_t_ = -1;
+    update_lfsr_jacks = update_pattern_dt_jacks = false;
 
     Clock.begin();
     Clock.attach_clock_callback(clock_callback);

      Display.fill_rect(34, 50, 3, 3, jack_t_ > 0 ? DUINO_SH1106::White : DUINO_SH1106::Black);
      Display.display(34, 36, 6, 6);
    }
  }

  void clock_clock_callback()


      Display.fill_rect(10, 41, 3, 3, DUINO_SH1106::Black);
      Display.fill_rect(115, 41, 3, 3, DUINO_SH1106::Black);
    }

    update_lfsr_jacks = true;
  }

  void clock_external_callback()
