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I bought a Teensy 3.1 and the associated audio module from pjrc:
Teensy 3.1 processor
Audio Module

Some pins and connectors are required to make these into a stack:

I then installed and used the audio library to test the module from: https://github.com/PaulStoffregen/Audio

There is a useful forum on this audio at: http://forum.pjrc.com/threads/24793-Audio-Library?highlight=audio

I am able to generate audio and play it to audio headphones. The library has a set of primitives that drive the module. In the releases there is a copy of my test code and the associated library.

Inexpensive display: QVGA display

Teensy Work Log for Michael Newman. Send comments and corrections to:
Webmaster: mnewman@dragonnorth.com