Once restarted SSH into the Pi and check that the audio drivers / card is available to ALSA.
pi@raspberrypi ~ $ aplay -l
If the IQaudIO board and drivers have been installed correctly you should see something similar to:
pi@iqaudio ~ $ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: IQaudIODAC [IQaudIODAC], device 0: IQaudIO DAC HiFi pcm512x-hifi-0 []
Subdevices: 0/1
Subdevice #0: subdevice #0
v32
24-Nov-2019
23
