// https://wokwi.com/projects/426319240866310145

void setup() {
  Serial.begin(115200);
  Serial.println("\nWake Up!\n");

  noteOn(42, "test", 0);
  noteOff(777, "also test", 0);
}

void loop() {
  delay(433);

  wtf();
}

int SLIDE1;
int SLIDE1_OLD = -1;
int lastNote = -1;

# define TRANS_KEY  10

void wtf()
{
  int theReading = analogRead(A0);
//  Serial.print(theReading); Serial.print(" <A0   ");

  int SLIDE1 = map(theReading, 50, 975, 1, 14);

  if (analogRead(0) < 50) {
    SLIDE1 = 0;
  }
  if (analogRead(0) > 975) {
    SLIDE1 = 15;
  }

  if  (SLIDE1 != SLIDE1_OLD) {

    Serial.print("SLIDE1> "); Serial.print(SLIDE1);
    Serial.println("");

    if  ((SLIDE1 > 0) && (SLIDE1 < 15))          {
      noteOff(lastNote, " 1..14 ", 1);
      noteOn((SLIDE1 + 59 + TRANS_KEY), " 1..14 ", 1);
      lastNote = SLIDE1 + 59 + TRANS_KEY;
    }
    if  (SLIDE1 == 0)           {
      noteOff(lastNote, " ZERO ", 1);
    }
    if  (SLIDE1 == 15)         {
      noteOff(lastNote, " FIFTEEN ", 1);
    }

    SLD_SCN (SLIDE1);
    SLIDE1_OLD = SLIDE1;
  }
}

void noteOn(int aNote, char *msg, int)
{
  Serial.print("              note on : "); Serial.print(msg); Serial.println(aNote);
}

void noteOff(int aNote, char *msg, int)
{
  Serial.print("             note off : "); Serial.print(msg); Serial.println(aNote);
}

void SLD_SCN(int wtf)
{
  Serial.print("     SLD_SCN : "); Serial.println(wtf); 
}

/*

  if  (SLIDE1 != SLIDE1_OLD) {
    if  ((SLIDE1 > 0) && (SLIDE1 < 15))          {
      noteOff(Last_Note, 0, 1);
      noteOn((SLIDE1 + 59 + TRANS_KEY), 127, 1);
      Last_Note = SLIDE1 + 59 + TRANS_KEY;
    }
    if  (SLIDE1 == 0)           {
      noteOff(Last_Note, 0, 1);
    }
    if  (SLIDE1 == 15)         {
      noteOff(Last_Note, 0, 1);
    }

    SLD_SCN (SLIDE1);
    SLIDE1_OLD = SLIDE1;
  }
  }
*/