 void reset_isr()
 {
   stage = step = 0;
-  retrigger = true;
 }
 
 void setup()

      last_gate = gate;
      last_stage = stage;
      display_changed = true;
    }

    if(display_changed)
    {


  unsigned long bpm_to_us(uint8_t bpm)
  {
    return 750000 / (unsigned long)bpm;
  }

  void display_slew_rate(int16_t x, int16_t y, uint8_t rate, DUINO_SSD1306::SSD1306Color color)
