Setup and Support

Fe-Pi Audio board driver code are now in the official Raspberry Pi kernel since v4.9.13   https://github.com/raspberrypi/linux/pull/1867

GPIO pins the Fe-Pi Audio Z V1 and V2 boards uses can be found here. 

Configuring Fe-Pi Audio is done using Device Tree overlays.

To do this, you must edit /boot/config.txt and add the following lines...
dtoverlay=fe-pi-audio
dtoverlay=i2s-mmap

If you want the on-board Raspberry Pi sound devices(HDMI, 3.5mm jack) to be disabled then change...
dtparam=audio=on to dtparam=audio=off

Run the following command to edit the file.
sudo nano /boot/config.txt

Reboot the Raspberry Pi.

Run the following commands to display a list of Audio Devices.
aplay –l
arecord –l

You should see Fe-Pi as your device, or as one of your devices if you have other sound devices.

Run the following command to display the mixer settings for all soundcards and devices.
alsamixer

You can adjust the levels for Headphone, PCM, Lineout, Microphone, and Capture.
Also you can select what input to capture, either Microphone or Line In, and what source to select for the headphones, either Line In or DAC.
See the alsamixer Linux man page for more detail on how to use alsamixer.

You may also use the mixer provided with Raspbian.
Under Preferences, select Audio Device Settings. Select the Fe-Pi Audio Sound card, and press Select Controls, if controls are not displayed.