/usr/share/alsa/cards/VXPocket.conf is in libasound2 1.0.25-1ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | #
# Configuration for Digigram VXpocket
#
<confdir:pcm/front.conf>
VXPocket.pcm.front.0 {
	@args [ CARD ]
	@args.CARD {
		type string
	}
	type hw
	card $CARD
}	
<confdir:pcm/iec958.conf>
VXPocket.pcm.iec958.0 {
	@args [ CARD AES0 AES1 AES2 AES3 ]
	@args.CARD {
		type string
	}
	@args.AES0 {
		type integer
	}
	@args.AES1 {
		type integer
	}
	@args.AES2 {
		type integer
	}
	@args.AES3 {
		type integer
	}
	type hooks
	slave.pcm {
		type hw
		card $CARD
	}
	hooks.0 {
		type ctl_elems
		hook_args [
			{
				interface PCM
				name "IEC958 Playback Default"
				lock true
				preserve true
				optional true
				value [ $AES0 $AES1 $AES2 $AES3 ]
			}
			{
				# for compatibility with older drivers
				name "IEC958 Playback Default"
				lock true
				preserve true
				optional true
				value [ $AES0 $AES1 $AES2 $AES3 ]
			}
		]
	}
}
 |