Here your are the code, but plenty of people used it with no problem:
// Teensy-Synth Part 3
// Keyboard Test
// By Notes and Volts
// www.notesandvolts.com
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>
// GUItool: begin automatically generated...