Some more investigation is required… the /DietPi/config.txt edit with
dtoverlay=iqaudio-dacplus,auto_mute_amp
this worked and the Mute light is now off…now to find my speakers
root@DietPi93:~# sudo sh -c "echo 22 > /sys/class/gpio/export"
root@DietPi93:~# sudo sh -c "echo out >/sys/class/gpio/gpio22/direction"
root@DietPi93:~# sudo sh -c "echo 1 >/sys/class/gpio/gpio22/value"
root@DietPi93:~#
The above also worked…happy bunny