// Pin 11 has the LED on Teensy 2.0
// Pin 6  has the LED on Teensy++ 2.0
// Pin 13 has the LED on Teensy 3.0
// Pin 13 has the LED on Teensy 3.6
int led = 13;

// the setup routine runs once when you press reset:
void setup() {
  pinMode(13, OUTPUT);
}

void loop() {
  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);               // wait for a second
  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);               // wait for a second
}

#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>

AudioSynthWaveformSine sine1;
AudioOutputAnalog  dac1;
AudioConnection    patchCord1(sine1, dac1);

void setup() {
  AudioMemory(3);
}

void loop() {
  sine1.frequency(1000);
  sine1.amplitude(0.8);
}