ubuntu-22.04.3-desktop-amd64/casper/filesystem/usr/share/alsa/alsa.conf.d/50-arcam-av-ctl.conf

ctl.arcam_av {
	@args [ PORT ]
	@args.PORT {
		type string
		default "/dev/ttyUSB0"
	}
	type arcam_av
	port $PORT
	hint {
		show {
			@func refer
			name defaults.namehint.basic
		}
		description "Arcam-AV Amplifier"
	}
}