aplay -l doesn't see my loopback sound card

Question

I want the only device on this headless system to be the loopback audio. One application will produce audio that will serve as the input to a streaming server.

But aplay -l (and other programs that enumerate audio devices) don't see it

$ ls -l /proc/asound/cards
-r--r--r-- 1 root root 0 Mar 18 18:22 /proc/asound/cards

$ cat /proc/asound/cards
0 [Loopback       ]: Loopback - Loopback
                      Loopback 1

$ aplay -l
aplay: device_list:268: no soundcards found...

Here's my /etc/modprobe.d/alsa-base.conf

alias snd-card-0 snd-aloop
options snd-aloop index=0 pcm_substreams=2

alias snd-card-1 snd-pcm
options snd-pcm index=1

Here's the output of ls -l /dev/snd

crw-rw---- 1 root audio 116,  6 Mar 18 19:07 controlC0
crw-rw---- 1 root audio 116,  5 Mar 18 19:15 pcmC0D0c
crw-rw---- 1 root audio 116,  4 Mar 18 19:15 pcmC0D0p
crw-rw---- 1 root audio 116,  3 Mar 18 19:15 pcmC0D1c
crw-rw---- 1 root audio 116,  2 Mar 18 19:07 pcmC0D1p
crw-rw---- 1 root audio 116,  1 Mar 18 18:49 seq
crw-rw---- 1 root audio 116, 33 Mar 18 19:07 timer

Any thoughts? I'm on 14.04.

Answer 1

I fixed it! I needed to be in the group "audio" to make it all work.

Fixed with

usermod -a -G audio [username]

It makes sense from seeing the ownership of the devices in /dev/snd, I guess, but I didn't figure this out until I saw an unrelated tutorial on how to get sound to work on rasberian