No usb audio from Teensy 3.2 to Mac

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Hi, I'm having trouble sending audio from my Teensy 3.2 to my Mac. This is my code, very simple, but I feel that I'm missing something basic:


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

AudioOutputUSB usb1;
AudioInputUSB usb2;
AudioSynthWaveform waveform1;
AudioConnection patchCord1(waveform1, 0, usb1, 0);
AudioConnection patchCord2(waveform1, 0, usb1, 1);

void setup() {
AudioMemory(10);
waveform1.pulseWidth(0.5);
waveform1.begin(0.4, 220, WAVEFORM_PULSE);
}

void loop() {
}


I have selected Tools->USB->Audio. The Teensy show up as a soundcard, but there seems to be no audio when I look at the VU meter on the System Preferences. Also streaming into SuperCollider there seems to be no sound coming from the Teensy. I don't need an audio adaptor to make this work, right? OS X is 10.10.5, Teensyduino is 1.40.
 
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