Here is the code, i know it looks crazy, but all you need to change is the buttons, faders etc. Everything in Blue is a comment and not part of the code.
For example
Analog fader2(18, Channel_Volume, 2); the number 18 is pin 18 on the Teensy
Digital button2(1, C4+1, 1, velocity) the number 1 after the parentheses is pin one. You may note that the C4+x just counts on, with how many i have hooked up.
/*
This is an example of the "Analog" class of the MIDI_controller library.
Connect 4 faders or potentiometers to A0-A3. These will be MIDI channel volumes of channels 1-4.
Map these in your DAW or DJ software.
If you are using a Teensy, make sure you have the USB type set to MIDI.
If you are using an Arduino Uno or Mega, use the HIDUINO firmware for the ATmega16U2.
Written by tttapa, 21/08/2015
https://github.com/tttapa/MIDI_controller
*/
#include <MIDI_controller.h>
// include the library
const static byte Channel_Volume = 0x7;
// controller number 7 is defined as Channel Volume in the MIDI implementation.
const static size_t analogAverage = 8;
// Use the average of 8 samples to get smooth transitions and prevent noise
const static byte velocity = 127;
// the maximum velocity, since MIDI uses a 7-bit number for velocity.
const static int latchTime = 3000;
// the amount of time (in ms) the note is held on. Read documentation or see source code for more information.
const static byte C4 = 60;
// note number 60 is defined as middle C in the MIDI implementation.
const static byte E0 = 16;
// note number 60 is defined as middle C in the MIDI implementation, so 16 is E0
const byte Channel = 1;
// MIDI channel 1
const byte Controller = 0x14;
// MIDI controller number
const int speedMultiply = 1;
// no change in speed of the encoder
//________________________________________________________________________________________________________________________________
//DigitalLatch switch1(26, E0, 1, velocity, latchTime);
// Create a new member of the class 'Digital', called 'button1', on pin 2, that sends MIDI messages with note 'C4' (60) on channel 1, with velocity 127).
DigitalLatch switch2(14, E0+1, 1, velocity, latchTime);
DigitalLatch switch3(15, E0+2, 1, velocity, latchTime);
DigitalLatch switch4(16, E0+3, 1, velocity, latchTime);
Analog fader1(17, Channel_Volume, 1);
// Create a new instance of the class 'Analog, called 'fader1', on pin A0, that sends MIDI messages with controller 7 (channel volume) on channel 1.
Analog fader2(18, Channel_Volume, 2);
Analog fader3(19, Channel_Volume, 3);
Analog fader4(20, Channel_Volume, 4);
Analog fader5(21, Channel_Volume, 5);
Analog fader6(22, Channel_Volume, 6);
Analog fader7(23, Channel_Volume, 7);
Digital button1(0, C4, 1, velocity);
// Create a new instance of the class 'Digital', called 'button1', on pin 2, that sends MIDI messages with note 'C4' (60) on channel 1, with velocity 127).
Digital button2(1, C4+1, 1, velocity);
// C4 + 1 = C#4
Digital button3(4, C4+2, 1, velocity);
// C4 + 2 = D4
Digital button4(5, C4+3, 1, velocity);
Digital button5(6, C4+4, 1, velocity);
Digital button6(7, C4+5, 1, velocity);
Digital button7(8, C4+6, 1, velocity);
Digital button8(9, C4+7, 1, velocity);
Digital button9(10, C4+8, 1, velocity);
Digital button10(11, C4+9, 1, velocity);
Digital button11(12, C4+10, 1, velocity);
Digital button12(24, C4+11, 1, velocity);
Digital button13(25, C4+12, 1, velocity);
Digital button14(26, C4+13, 1, velocity);
RotaryEncoder enc(3, 2, Controller, Channel, speedMultiply, NORMAL_ENCODER, POS1_NEG127);
// Create a new instance of the class 'RotaryEncoder', called 'enc', on pin 2 and 3, controller number 0x14, on channel1, no change in speed (speed is multiplied by 1), it's used as a Jog wheel, and the sign mode is set to two's complement.
//________________________________________________________________________________________________________________________________
void setup(){
USBMidiController.blink(LED_BUILTIN);
// flash the built-in LED (pin 13 on most boards) on every message
USBMidiController.setDelay(15);
// wait 15 ms after each message not to flood the connection
USBMidiController.begin();
// Initialise the USB MIDI connection
delay(1000);
// Wait a second...
fader1.average(analogAverage);
// Use the average of 8 samples to get smooth transitions and prevent noise
fader2.average(analogAverage);
fader3.average(analogAverage);
fader4.average(analogAverage);
fader5.average(analogAverage);
fader6.average(analogAverage);
fader7.average(analogAverage);
}
//________________________________________________________________________________________________________________________________
void loop(){
//switch1.refresh();
// refresh the switch (check whether the input has changed since last time, if so, send it over MIDI)
switch2.refresh();
switch3.refresh();
switch4.refresh();
fader1.refresh();
// refresh the fader (check whether the input has changed since last time, if so, send it over MIDI)
fader2.refresh();
fader3.refresh();
fader4.refresh();
fader5.refresh();
fader6.refresh();
fader7.refresh();
button1.refresh();
// refresh the button (check whether the input has changed since last time, if so, send it over MIDI)
button2.refresh();
button3.refresh();
button4.refresh();
button5.refresh();
button6.refresh();
button7.refresh();
button8.refresh();
button9.refresh();
button10.refresh();
button11.refresh();
button12.refresh();
button13.refresh();
button14.refresh();
enc.refresh();
}
If anyone is remotely interested in making their own midi controller i would be happy to help.
) four Linier potentiometers, three rotary potentiometers and one rotary encoder. The linier faders control the flood lights and the rotary encoder changes the flood light colors. Oh, I got the potentiometers and encoder from Newark, but Digikey and Mouser also have them.
I love home-brew gadgets like this. Are the rotary pots linear? It's a big deal in the guitar world 
