Toggle buttons and leds and send midi cc about control-surface HOT 4 CLOSED

#include <Control_Surface.h>

USBMIDI_Interface midi;

CD74HC4051 mux = {
  2,        // Input pin
  {3, 4, 5} // Address pins S0, S1, S2
};

SPIShiftRegisterOut<8> sreg = {
  10,       // Latch pin (ST_CP)
  MSBFIRST, // Byte order
};

CCButtonLatched buttons[] = {
  {mux.pin(0), 0},
  {mux.pin(1), 1},
  {mux.pin(2), 2},
  {mux.pin(3), 3},
  {mux.pin(4), 4},
  {mux.pin(5), 5},
  {mux.pin(6), 6},
  {mux.pin(7), 7},
};

void setup() {
  Control_Surface.begin();
}

void loop() {
  Control_Surface.loop();
  uint8_t i = 0;
  for (CCButtonLatched &button : buttons)
    sreg.digitalWrite(i++, button.getState());
}