I have a rpi2 with a pi-DigiAmp+ which to get working I use the below code:
echo “22” > /sys/class/gpio/export
echo “out” > /sys/class/gpio/gpio22/direction
echo “1” > /sys/class/gpio/gpio22/value
into /etc/rc.local along with selecting the IQaudio DACplus overlay.
After the newest update (1.1.16) the pi-DigiAmp+ no longer worked. I reverted back to the previous version and all fine. Not sure what might have caused it to stop working but I thought it would be good to see if it can be fixed.