The interface does not appear under Sound Settings > Hardware. However it does appear as an interface in qjackctl.
'cat /proc/asound/cards' shows the correct interface:
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0 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0xb0900000 irq 47
1 [VSL ]: USB-Audio - AudioBox 44 VSL
PreSonus AudioBox 44 VSL at usb-0000:00:1d.7-1.2, high speed
2 [Generic ]: HDA-Intel - HD-Audio Generic
HD-Audio Generic at 0xb0840000 irq 48
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0 snd_hda_intel
1 snd_usb_audio
2 snd_hda_intel
'aplay -l' doesn't show the device:
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**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: Cirrus Analog [Cirrus Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: Cirrus Digital [Cirrus Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
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card 0: PCH [HDA Intel PCH], device 0: Cirrus Analog [Cirrus Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: Cirrus Digital [Cirrus Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
'lsusb':
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Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 0424:2513 Standard Microsystems Corp.
Bus 001 Device 003: ID 05ac:8509 Apple, Inc. FaceTime HD Camera
Bus 002 Device 002: ID 0424:2513 Standard Microsystems Corp.
Bus 001 Device 004: ID 0a5c:4500 Broadcom Corp. BCM2046B1 USB 2.0 Hub (part of BCM2046 Bluetooth)
Bus 001 Device 005: ID 05ac:0245 Apple, Inc. Internal Keyboard/Trackpad (ANSI)
Bus 002 Device 003: ID 05ac:8242 Apple, Inc. IR Receiver [built-in]
Bus 002 Device 004: ID 194f:0102
Bus 001 Device 008: ID 05ac:821a Apple, Inc. Bluetooth Host Controller
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snd_seq_dummy 12798 0
snd_hda_codec_hdmi 32474 1
snd_hda_codec_cirrus 23965 1
snd_hda_intel 33773 5
snd_usb_audio 122982 0
snd_hda_codec 127723 3 snd_hda_codec_hdmi,snd_hda_codec_cirrus,snd_hda_intel
snd_usbmidi_lib 25395 1 snd_usb_audio
snd_hwdep 13668 2 snd_usb_audio,snd_hda_codec
snd_pcm 97188 4 snd_hda_codec_hdmi,snd_hda_intel,snd_usb_audio,snd_hda_codec
snd_seq_midi 13324 0
snd_seq_midi_event 14899 1 snd_seq_midi
snd_seq 61896 3 snd_seq_dummy,snd_seq_midi,snd_seq_midi_event
snd_timer 29990 2 snd_pcm,snd_seq
snd_rawmidi 30748 2 snd_usbmidi_lib,snd_seq_midi
snd_seq_device 14540 4 snd_seq_dummy,snd_seq_midi,snd_seq,snd_rawmidi
snd 78855 22 snd_hda_codec_hdmi,snd_hda_codec_cirrus,snd_hda_intel,snd_usb_audio,snd_hda_codec,snd_usbmidi_lib,snd_hwdep,snd_pcm,snd_seq,snd_timer,snd_rawmidi,snd_seq_device
soundcore 15091 1 snd
snd_page_alloc 18529 2 snd_hda_intel,snd_pcm
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00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Universal Host Controller #5 (rev 05)
00:1a.7 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Universal Host Controller #1 (rev 05)
00:1d.7 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
Thanks in advance!