Code from the video at https://youtu.be/T-YWTxda1x0

mozzi4knob.ino

#include <MozziGuts.h>
#include <Oscil.h>
#include <tables/chum9_int8.h> // recorded audio wavetable
#include <tables/cos512_int8.h> // for filter modulation
#include <LowPassFilter.h>
#include <mozzi_rand.h> // for rand()
#include <EventDelay.h> // for scheduling events

#define CONTROL_RATE 64 // powers of 2 please

Oscil<CHUM9_NUM_CELLS, AUDIO_RATE> aCrunchySound1(CHUM9_DATA); //audio oscillator
Oscil<CHUM9_NUM_CELLS, AUDIO_RATE> aCrunchySound2(CHUM9_DATA); //audio oscillator
Oscil<COS512_NUM_CELLS, CONTROL_RATE> kFilterMod1(COS512_DATA); // to modulate filter frequency
Oscil<COS512_NUM_CELLS, CONTROL_RATE> kFilterMod2(COS512_DATA); // to modulate filter frequency

LowPassFilter lpf1;
LowPassFilter lpf2;

EventDelay kWhoseTurnDelay;

int lastkv = 0;
int lastkv1 = 0;
int lastkv2 = 0;
int lastkv3 = 0;
int lastkv4 = 0;
int lastfv = 4;
int fvdir = 3;

const unsigned int MILLIS_PER_SWEEP = 500;

void setup(){
  startMozzi(CONTROL_RATE);
  aCrunchySound1.setFreq(2.f);
  aCrunchySound2.setFreq(1.f);
  kFilterMod1.setFreq(1.3f);
  kFilterMod2.setFreq(0.7f);
  lpf1.setResonance(180);
  lpf2.setResonance(220);
  kWhoseTurnDelay.set(MILLIS_PER_SWEEP);
  kWhoseTurnDelay.start();
  Serial.begin(9600);
}

void updateControl(){

  int knob1_value = mozziAnalogRead(0); 
  knob1_value = map(knob1_value, 0, 800, 0, 255);
  // map the modulation depth into the filter range, 0-255 to represent 0-8192 Hz
  if(lastkv1 != knob1_value) {
    lpf2.setResonance(knob1_value);
    lastkv1 = knob1_value;
  }
 

  int knob2_value = mozziAnalogRead(1); 
  knob2_value = map(knob2_value, 0, 800, 0, 255);
  if(lastkv2 != knob2_value) {
   lpf1.setResonance(knob2_value);
   lastkv2 = knob2_value;
  }


  int knob3_value = mozziAnalogRead(2); 
  knob3_value = map(knob3_value, 0, 800, 16.0f, 0.1f);
  if(lastkv3 != knob3_value) {
   kFilterMod1.setFreq(knob3_value);
   lastkv3 = knob3_value;
  }

  int knob4_value = mozziAnalogRead(3); 
  knob4_value = map(knob4_value, 0, 800, 16.0f, 0.1f);
  if(lastkv4 != knob4_value) {
   kFilterMod2.setFreq(knob4_value);
   lastkv4 = knob4_value;
  }
  

  int knob_value = mozziAnalogRead(4); 
  knob_value = map(knob_value, 250, 1024, 5, 250);
  //Serial.println(knob_value);
  // map the modulation depth into the filter range, 0-255 to represent 0-8192 Hz
  if(lastkv != knob_value) {
    //aCrunchySound1.setFreq(knob_value);
    kWhoseTurnDelay.set(knob_value);
    lastkv = knob_value;
  }

  if(kWhoseTurnDelay.ready()){
    
    int freq_value = (byte) lastfv % 18;
    if(lastfv%18>=15 || lastfv<=0) {
      fvdir = -fvdir;
    }
    lastfv = lastfv + fvdir;
    kWhoseTurnDelay.start();
    aCrunchySound1.setFreq(freq_value);
  }  


  
  byte cutoff_freq1 = 100 + kFilterMod1.next()/2; // 100 ± 63
  lpf1.setCutoffFreq(cutoff_freq1);
  // also update lpf2 cutoff
  byte cutoff_freq2 = 70 + kFilterMod2.next()/4; // 70 ± 31
  lpf2.setCutoffFreq(cutoff_freq2);
}


int updateAudio(){
  return (((char)lpf1.next(aCrunchySound1.next()))>>1) + (char)lpf2.next(aCrunchySound2.next());
  
}


void loop(){
  audioHook();
}