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Thread: No usb audio from Teensy 3.2 to Mac

  1. #1
    Junior Member
    Join Date
    Jan 2018

    No usb audio from Teensy 3.2 to Mac

    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() {
    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.

  2. #2
    Senior Member PaulStoffregen's Avatar
    Join Date
    Nov 2012
    You must add one non-USB input or output, even if it isn't used. See the notes in the design tool docs for the USB in & out.

  3. #3
    Junior Member
    Join Date
    Jan 2018
    Great, that solved the problem! Thanks!

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