Suggested Reading; The Configuration Utility - sparkfun DEV-14034 Hook-Up Manual

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cause damage to the audio device. Note that the Spectacle data jacks are
directional: the one marked "In" should be plugged into the "upstream"
board (i.e., closer to the Director Board than this one) and the one marked
"Out" connects to the next downstream board. The "Out" jack is not for
audio signals.
The audio output is designed for amplified devices only. This means that
any attempt to use the Spectacle Audio Board with headphones or
unamplified speakers will fail to produce audible output. SparkFun sells a
small, amplified, rechargeable speaker which is specifically intended for use
with the Spectacle Audio Board.
The Spectacle Audio Board uses a Micro SD card to store the audio files to
be played. The files should be stored as .ogg Vorbis encoded files. This
free audio file format can be played and created on any type of computer.
Later in the tutorial we'll show you how to convert from MP3, WAV, or other
file formats to the .ogg format.
The files must be named by number, which is how they will be referred to
from within the configuration application. Filename examples are 00.ogg,
01.ogg, 02.ogg, and so forth.

Suggested Reading

Before proceeding, you should read through the Spectacle User's Guide. It
will give you the basics you'll need to know about how Spectacle works to
follow the rest of this tutorial.

The Configuration Utility

Spectacle Audio Board