Problème capteur piezo aucune valeur

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exemple de code :

#include <midi_serialization.h>
#include <usbmidi.h>
#include <Bounce2.h>


// See midictrl.png in the example folder for the wiring diagram,
// as well as README.md.
int sensorValue;
int inter;
// variable to calibrate low value
int sensorLow = 60;
// variable to calibrate high value
int sensorHigh = 700;
const int interPin = 2;

void sendCC(uint8_t channel, uint8_t control, uint8_t value) {
  USBMIDI.write(0xB0 | (channel & 0xf));
  USBMIDI.write(control & 0x7f);
  USBMIDI.write(value & 0x7f);
}

void sendNote(uint8_t channel, uint8_t note, uint8_t velocity) {
  USBMIDI.write((velocity != 0 ? 0x90 : 0x80) | (channel & 0xf));
  USBMIDI.write(note & 0x7f);
  USBMIDI.write(velocity & 0x7f);
}

void setup() {
  //touch.attach( touchPin, INPUT);
  //touch.interval(5);
  //Serial.begin(9600);
  pinMode(interPin, INPUT_PULLUP);
  
}

void loop() {
  //Handle USB communication
  USBMIDI.poll();

  while (USBMIDI.available()) {
    // We must read entire available data, so in case we receive incoming
    // MIDI data, the host wouldn't get stuck.
    u8 b = USBMIDI.read();
  }
 

  inter = digitalRead(interPin);
  if (inter == LOW) {
    sensorValue = analogRead(A0);
    Serial.println(sensorValue);
    //Serial.println(sensorValue);
    if (sensorValue > sensorLow && sensorValue < 150 ) {
      sendNote(0, 64, 120);
      delay(10);
    }
    else if (sensorValue > 150 && sensorValue < 300 ) {
      sendNote(0, 66, 120);
      delay(10);
      }
      else if (sensorValue > 300 && sensorValue < 600 ) {
      sendNote(0, 68, 120);
      delay(10);
      }
      else {
         for ( int i = 50; i < 101; ++i) {
        sendNote(0, i, 0);
        delay(1);
      }
        
    }

  }
  else {
    for ( int i = 50; i < 101; ++i) {
        sendNote(0, i, 0);
        delay(1);
      }

  }


  // Flush the output.
  USBMIDI.flush();
}

avec ce code si la valeur du capteur atteint 500, ça va déclencher les 3 notes (68, 66, et 64). puisque la valeur du capteur redescend une fois qu'elle a atteint son maximum.