It's Here! Chris Odom's Physical Computing & Robotics with the Arduino IDE - Volume One

Audio Adapter Board for Teensy 3 Series

$14.25

These things are awesome and easy to use! 

I didn't like the idea of dedicating a Teensy to it, so I designed a simple adapter to make mounting the Audio adapter a snap. Now you can wire it to a Teensy on the PRT motherboard and still have easy access to all the unused pins. To see the adapter click here go to Thingiverse. To learn everything you ever wanted about the board please check out the PJRC site here.

This audio adapter lets you easily add high quality 16 bit, 44.1 kHz sample rate (CD quality) audio to your projects with Teensy 3.0 or 3.1 or 3.2. It supports stereo headphone and stereo line-level output, and also stereo line-level input or mono microphone input.

The Teensy Audio Library lets you use the input and output simultaneously together with a toolkit of audio processing objects, to easily create all types of sophisticated audio applications. You can play multiple sound files, create synthesized waveforms, apply effects, mix multiple streams and output high quality audio to the headphones or line out pins.

Teensy 3.0 & 3.1 & 3.2 have the Cortex-M4 DSP instructions which provide plenty of computational power for real-time FFT (spectrum analysis), opening up the possibility of creating advanced sound-reactive projects.