void setup() {
  // Set MIDI baud rate:
  Serial.begin(256000);
}


void loop() {

int piez0 = analogRead(A0)/2;
int piez1 = analogRead(A1);
int piez2 = analogRead(A2);
int piez3 = analogRead(A3);
int vel0 = piez0/4;
int vel1 = piez1/4;
int noteON = 144;
int noteOFF = 128;
int hihat = 42;
int snare = 43;
int crash = 44;

if (piez0 > 300) {
 MIDImessage(noteON, hihat, 127);
 delay(100);
 MIDImessage(noteOFF, hihat, 127);
  }

if (piez1 > 300) {
 MIDImessage(noteON, snare, 127);
 delay(100);
 MIDImessage(noteOFF, snare, 127);
  }

if (piez2 > 300) {
 MIDImessage(noteON, crash, 127);
 delay(200);
 MIDImessage(noteOFF, crash, 127);
  }

}


void MIDImessage(int command, int MIDInote, int MIDIvelocity) {
  Serial.write(command);
  Serial.write(MIDInote);
  Serial.write(MIDIvelocity);

}