The problem looks like this:
user@computer:~$ amixer
ALSA lib control_ext.c:664:(snd_ctl_ext_create) ctl_ext: Plugin version mismatch
amixer: Mixer attach default error: No such device or address
user@computer:~$ alsamixer
ALSA lib control_ext.c:664:(snd_ctl_ext_create) ctl_ext: Plugin version mismatch
cannot open mixer: No such device or address
user@computer:~$
user@computer:~$ ls -l /dev/snd/
total 0
drwxrwxrwx 2 root audio 60 Jun 1 17:52 by-path
crw-rw-rwT+ 1 root audio 116, 8 Jun 1 17:52 controlC0
crw-rw-rwT+ 1 root audio 116, 7 Jun 1 17:52 hwC0D0
crw-rw-rwT+ 1 root audio 116, 6 Jun 1 17:52 hwC0D1
crw-rw-rwT+ 1 root audio 116, 5 Jun 1 18:59 pcmC0D0c
crw-rw-rwT+ 1 root audio 116, 4 Jun 1 22:46 pcmC0D0p
crw-rw-rwT+ 1 root audio 116, 3 Jun 1 17:52 pcmC0D6c
crw-rw-rwT+ 1 root audio 116, 2 Jun 1 17:52 pcmC0D6p
crw-rw-rwT+ 1 root audio 116, 1 Jun 1 17:52 seq
crw-rw-rwT+ 1 root audio 116, 33 Jun 1 17:52 timer
user@computer:~$
user@computer:~$ which amixer
/usr/bin/amixer
user@computer:~$ ls -l /usr/bin/ | grep amixer
-rwxr-xr-x 1 root root 59588 Jan 10 02:46 alsamixer
-rwxr-xr-x 1 root root 51280 Jan 10 02:46 amixer
-rwxr-xr-x 1 root root 56076 Nov 23 2011 gnome-alsamixer
user@computer:~$
user@computer:~$ groups
user disk dialout cdrom floppy audio video plugdev netdev fuse
The solution? It was simply deleting the .pulse directory in my home directory.
Thanks goes out to debian forums and the user dmuc for this one.
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