Could someone please help me figure out why I can't get my eighth Wave file to play in this code? The first seven play perfectly (from SD). When I add the eighth (pinMode(buttonPin8, INPUT_PULLUP) I lose all the audio from all pins. The pins are detected as being activated because they print in my serial monitor, but there is no sound. I'm not sure how to fix my code. I am ultimately trying to include more wave files in my code, each activated with a unique pin, but I can't get beyond seven.

I've tried the SamplePlayer code, but do not have enough RAM on the Teensy board for the sound files.

I've also tried to play from flash, and added a flash chip to my Teensy audio board, but I can't figure out how to write that code.

I am using Windows 8.1, Teensy 3.5 and the Teensy Audio Shield.

Code:
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>
#include <Bounce.h>

// How many leds are in the strip?
//const int numled = 77;
//const int numled = 10;

// Data pin that led data will be written out over
const int pin = 1; 

const int buttonPin1 = 2;
Bounce pushbutton1 = Bounce(buttonPin1, 20);
const int buttonPin2 = 3;
Bounce pushbutton2 = Bounce(buttonPin2, 20);
const int buttonPin3 = 4;
Bounce pushbutton3 = Bounce(buttonPin3, 20);
const int buttonPin4 = 5;
Bounce pushbutton4 = Bounce(buttonPin4, 20);
const int buttonPin5 = 6;
Bounce pushbutton5 = Bounce(buttonPin5, 20);
const int buttonPin6 = 7;
Bounce pushbutton6 = Bounce(buttonPin6, 20);
const int buttonPin7 = 8;
Bounce pushbutton7 = Bounce(buttonPin7, 20);
const int buttonPin8 = 9;                                //New line trying to get 8th note, does not crash program
Bounce pushbutton8 = Bounce(buttonPin8, 20);             //New line trying to get 8th note, does not crash program


// GUItool: begin automatically generated code
AudioPlaySdWav           playSdWav1;     //xy=305,113
AudioPlaySdWav           playSdWav2;     //xy=324,180
AudioMixer4              mixer1;         //xy=523,163
AudioOutputI2S           i2s1;           //xy=729,205
AudioConnection          patchCord1(playSdWav1, 0, mixer1, 0);
AudioConnection          patchCord2(playSdWav2, 0, mixer1, 1);
AudioConnection          patchCord3(mixer1, 0, i2s1, 0);
AudioConnection          patchCord4(mixer1, 0, i2s1, 1);
AudioControlSGTL5000     sgtl5000_1;     //xy=536,299
// GUItool: end automatically generated code

void setup() {
  delay(200);
   // initialize the pushbutton pin as input:
  pinMode(buttonPin1, INPUT_PULLUP);
  pinMode(buttonPin2, INPUT_PULLUP);
  pinMode(buttonPin3, INPUT_PULLUP);
  pinMode(buttonPin4, INPUT_PULLUP);
  pinMode(buttonPin5, INPUT_PULLUP);
  pinMode(buttonPin6, INPUT_PULLUP);
  pinMode(buttonPin7, INPUT_PULLUP);
  //pinMode(buttonPin8, INPUT_PULLUP);                   //New line trying to get 8th note to work, uncommenting this line STOPS all audio
  
  AudioMemory(12);
  sgtl5000_1.enable();
  sgtl5000_1.volume(0.5);
  SPI.setMOSI(7);
  SPI.setSCK(14);
  if (!(SD.begin(BUILTIN_SDCARD))) {
    while (1) {
        delay(400);
    }
  }
}
void loop() {
  
  pushbutton1.update();
  if (pushbutton1.fallingEdge()) {
    playSdWav1.play("C.wav");
    Serial.println("C"); 
  }
  pushbutton2.update();
  if (pushbutton2.fallingEdge()) {
    playSdWav1.play("D.wav");
    Serial.println("D"); 
  }
  pushbutton3.update();
  if (pushbutton3.fallingEdge()) {
    playSdWav1.play("E.wav");
    Serial.println("E"); 
  }
  pushbutton4.update();
  if (pushbutton4.fallingEdge()) {
    playSdWav1.play("F.wav");
    Serial.println("F"); 
   }
  pushbutton5.update();
  if (pushbutton5.fallingEdge()) {
    playSdWav2.play("G.wav");
    Serial.println("G"); 
  }
  pushbutton6.update();
  if (pushbutton6.fallingEdge()) {
    playSdWav2.play("A.wav");
    Serial.println("A"); 
   }
 pushbutton7.update();
  if (pushbutton7.fallingEdge()) {
    playSdWav2.play("B.wav");
    Serial.println("B");  
  }
  if ( playSdWav1.isPlaying() == 0 ) {
    delay(100);
  if (playSdWav2.isPlaying() == 0 ) {
         }
     }
   }