70-alsa-permanent.rules

SUBSYSTEM!="sound", GOTO="my_usb_audio_end"
ACTION!="add", GOTO="my_usb_audio_end"

DEVPATH=="/devices/pci0000:00/0000:00:1f.3/sound/card?", ATTR{id}="BUILTIN"
DEVPATH=="/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3/sound/card?", ATTR{id}="CL1"
DEVPATH=="/devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2:1.3/sound/card?", ATTR{id}="CL2"

LABEL="my_usb_audio_end"

asound.conf

pcm.!default {
	     type hw
	     card "BUILTIN"
	     device 0
}
ctl.!default {
	     type hw
	     card "BUILTIN"
	     device 0
}

pcm.BUILTIN {
	     type hw
	     card "BUILTIN"
	     device 0
}
ctl.BUILTIN {
	     type hw
	     card "BUILTIN"
	     device 0
}

pcm.CL1 {
	type hw
	card "CL1"
	device 0
}
ctl.CL1 {
	type hw
	card "CL1"
	device 0
}

pcm.CL2 {
	type hw
	card "CL2"
	device 0
}
pcm.CL2 {
	type hw
	card "CL2"
	device 0
}