 
 volatile uint8_t stage, step;
 volatile bool gate, clock_gate, retrigger, reverse;
+
+DUINO_Filter * slew_filter;
 
 void clock_isr();
 void reset_isr();

              {
                params.vals.slew_rate = 16;
              }
              seq_values.slew_rate = params.vals.slew_rate;
              display->fill_rect(60, 13, 16, 5, DUINO_SSD1306::White);
              display_slew_rate(60, 13, params.vals.slew_rate, DUINO_SSD1306::Black);
              break;


#include <du-ino_function.h>
#include <du-ino_interface.h>
#include <du-ino_dsp.h>
#include <TimerOne.h>
#include <avr/pgmspace.h>
#include <util/atomic.h>
