Followed the description step by step, using HinTaks repository up to step 4 (excluding), recieved no error messages but arecord -L returns:
null
Discard all samples (playback) or generate zero samples (capture)
jack
JACK Audio Connection Kit
pulse
PulseAudio Sound Server
playback
ac108
default
output
usbstream:CARD=b1
bcm2835 HDMI 1
USB Stream Output
usbstream:CARD=Headphones
bcm2835 Headphones
USB Stream Output