Setup and Support
There was an issue with Line In not working, that has been fixed with a kernel update.
It can be fixed with running 'sudo rpi-update' https://github.com/raspberrypi/linux/issues/3468
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...
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.
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.
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.