DIY Programmable Pedal Loop Switcher Build (Part 1)

This is part 1 of a True Bypass 8 Loop programmable Loop Switcher that I intend to build. I outline the design and components involved in this video. The 8 Loop Switcher will be built around an Arduino Mega and will require some coding to make it work.
The component list:

225mm x 145mm diecast enclosure
2 x 8 channel relay boards
Arduino Mega
8 x momentary N/O foot switches
18 x 1/4 inch input jacks
power in socket
16 x LED or more

A computer will be required for programming along with a USB cable.

Here is the code thus far that is used in this video.
You can copy and paste from here to Arduino IDE.

/*
Intelligent LOOP SWITCHER for guitar pedal board
by Paul Graham
Note: This sketch is under development and is not complete.

Turns on and off pre-determined relays connected to digital
pin 13,12,11,10,9,8, when pressing a pushbutton attached to pin 2, 3 or 4 for diferent configs.


The circuit description:
* LED attached from pins 13 to 8 with 160 Ohm resistor in series to ground
* pushbuttons attached to pin 2 to 4 from +5V
* 5K resistor attached to pins 2 to 4 from ground
*/

// constants won't change. They're used here to
// set pin numbers:
const int button1 = 2; // button 1 input pin
const int button2 = 3; // button 2 input pin
const int button3 = 4; // bank button input pin
const int loop1 = 13; // loop 1 output pin
const int loop2 = 12; // loop 2 output pin
const int loop3 = 11; // loop 3 output pin
const int loop4 = 10; // loop 4 output pin
const int loop5 = 9; // loop 5 output pin
const int loop6 = 8; // loop6 output pin



// variables will change:
int buttonState1 = 0; // variable for reading button1 status
int buttonState2 = 0; // variable for reading button2 status
int buttonState3 = 0; // variable for reading bankbuttn1 status

void setup() {
// initialize the Loop pins as an outputs:
pinMode(loop1, OUTPUT);
pinMode(loop2, OUTPUT);
pinMode(loop3, OUTPUT);
pinMode(loop4, OUTPUT);
pinMode(loop5, OUTPUT);
pinMode(loop6, OUTPUT);

// initialize the button pins as an inputs:
pinMode(button1, INPUT);
pinMode(button2, INPUT);
pinMode(button3, INPUT);
}

void loop() {

buttonState1 = digitalRead(button1);

if (buttonState1 == HIGH) {
// turn LED on:
digitalWrite(loop1, HIGH);
digitalWrite(loop3, HIGH);
digitalWrite(loop5, HIGH);
digitalWrite(loop2, LOW);
digitalWrite(loop4, LOW);
digitalWrite(loop6, LOW);
}
buttonState2 = digitalRead(button2);
if (buttonState2 == HIGH) {
digitalWrite(loop1, LOW);
digitalWrite(loop3, LOW);
digitalWrite(loop5, LOW);
digitalWrite(loop2, HIGH);
digitalWrite(loop4, HIGH);
digitalWrite(loop6, HIGH);
}
buttonState3 = digitalRead(button3);
if (buttonState3 == HIGH) {
digitalWrite(loop1, HIGH);
digitalWrite(loop2, HIGH);
digitalWrite(loop3, LOW);
digitalWrite(loop4, LOW);
digitalWrite(loop5, HIGH);
digitalWrite(loop6, HIGH);
}
}