Text fade in

I'm having some trouble with my text. I cant get them all to fade in at the same rate and I don't know what im doing wrong. After t[0], all the other pieces of text seem to just appear rather than fading in like I want them to. Would really appreciate some help!

import ddf.minim.*;

Minim minim;
AudioPlayer track;



PFont sourceSans, helvet;
float textAlpha = 0;

String []t = {
 "43.8 billion people in the U.S. \n suffer from mental illness",
"Anxiety disorders affect 40 billion people, \n or 18.1%",
"There is a scarce \n but growing market for \n products, designs, \n and tools that \n combat mental health.",
"What can we, \n as designers do?"
};


void setup() {
  size (700, 600);
  noCursor();


sourceSans = createFont ("SourceSansPro-Light", 10);
helvet = createFont ("Helvetica-Bold", 40);


  minim = new Minim(this);
  track=minim.loadFile("heart.mp3");
  track.loop();

}



void draw() {
  background(0);
  strokeWeight(3);




  //(96,143,193) blue
  //(193,23,49) red

  translate(0, 250);
  for (int i = 0; i< track.bufferSize()-1; i++) {
    float x1 = map( i, 0, track.bufferSize(), 0, width );  //x1 values remapped to reach width
    float x2 = map( i+1, 0, track.bufferSize(), 0, width );


    if (track.left.get(i) == 0) {                          //stroke color
      stroke(96, 143, 193);
    } else if (track.left.get(i) >0) {
      stroke(193, 23, 49);
    } else if (track.left.get(i) < 0) {
      stroke(193, 23, 49);
    }


    line( x1, track.left.get(i), x2, track.left.get(i) *300);//draw a line from one buffer position to the next for both channels
                                                             //series of vertical lines
  }


  translate(0,-300);
  textFont(sourceSans);
  fill(255,textAlpha);

  if (millis() >=5000) {
  text(t[0], 100,100);
  textAlpha++;
}

if (millis() >=10000) {
  text(t[0], 100,200);
  textAlpha++;
}

if (millis() >= 12000) {
  text(t[2], 100,350);
  textAlpha++;
}


textSize(20);
if (millis() >= 14000) {
  text(t[3], 500,500);
  textAlpha++;
}

}