Volume Trigger Pins; Audio Outputs - Adafruit Audio FX Manual

Volume Trigger pins

These are two extra inputs that can be used to adjust the volume in GPIO trigger mode only. Connect buttons that go
from each pin to ground, when the button is pressed, the volume will decrease or increase
The volume is not stored during power cycling or resets, so it will have to be re-applied after restarts.

Audio Outputs

If you don't want to use the headphone jack, connect your amplifier to the Right, Left and Ground pins. These are line
level outputs for headphones of about 30 ohms, not for big speakers! There are output DC blocking capacitors so you
can safely connect directly to any kind of amplifier
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