#include <MIDI.h>

#define wah 21

MIDI_CREATE_DEFAULT_INSTANCE();

void bLoopPC(byte channel, byte number) {
  if (channel == 2, number == 1) {

    digitalWrite(wah, HIGH);
  
  }

  else {

    digitalWrite(wah, LOW);
    
  }

}

void setup() { 

  pinMode(wah, OUTPUT);
  MIDI.begin(2);
  setHandleProgramChange(bLoopPC);

}

void loop() {

  MIDI.read();

}