Using Gammon's LED Flasher library with a state machine?

Thank you for that. I was clearly up too late and should've gone to bed!

I've got the LED Flasher demo code merged with the switchCase example. There's something I don't get about how this library works...there doesn't seem to be any way to turn off the LEDs and then turn them back on. In the code below, case 0 causes all the LEDs to blink by updating them; case 1 shuts them off. However, when you switch from case 0 to case 1, some of the LEDs may stay lit, so I would like them to be off in case 1. The section of case 1 that's commented out doesn't work; instead, I added the digitalWrite commands for each LED to make sure they're off. When the code goes back to case 0 then the LEDs blink as expected.

// Merges LED Flasher with Switch Case demo, using a 5K pot

// Example of flashing multiple LEDs at different rates without delays
// Author: Nick Gammon
// Date: 23 December 2012

#include <LedFlasher.h>

const int sensorMin = 0;      // sensor minimum, discovered through experiment
const int sensorMax = 800;    // sensor maximum, discovered through experiment

// set up some LEDs
LedFlasher floodLight (8, 200, 300);
LedFlasher shuttleBayDoors (9, 300, 600);
LedFlasher impulseEngine (10, 900, 100);
LedFlasher strobe (11, 500, 1000);
LedFlasher navigation (12, 1000, 2000);
LedFlasher torpedoes (3, 250, 500);

void setup() 
  {      
  floodLight.begin ();
  shuttleBayDoors.begin ();
  impulseEngine.begin ();
  strobe.begin ();
  navigation.begin ();
  torpedoes.begin ();
  
 // initialize serial communication:
  Serial.begin(9600); 
  }  // end of setup

void loop() {
   // read the sensor:
  int sensorReading = analogRead(A0);
  // map the sensor range to a range of four options:
  int range = map(sensorReading, sensorMin, sensorMax, 0, 3);
  
  switch (range) {
  case 0:    // pot turned all the way off
    Serial.println("case 0");
  
  // update lights
  floodLight.update ();
  shuttleBayDoors.update ();
  impulseEngine.update ();
  strobe.update ();
  navigation.update ();
  torpedoes.update ();
     break;
  case 1:    // pot turned about 1/4 way
    Serial.println("case 1");
//  floodLight.off ();
//  shuttleBayDoors.off ();
//  impulseEngine.off ();
//  strobe.off ();
//  navigation.off ();
//  torpedoes.off ();    
  digitalWrite(8, LOW);    
  digitalWrite(9, LOW);
  digitalWrite(10, LOW);
  digitalWrite(11, LOW);
  digitalWrite(12, LOW);
  digitalWrite(3, LOW);
    
    break;
  case 2:    // pot turned about 1/2 of the way
    Serial.println("case 2");
    break;
  case 3:    // pot turned about 3/4 of the way
    Serial.println("case 3");
    break;     
  
  // do other useful stuff here ...

     } 
  }  // end of loop