I converted from pulseaudio to alsa because of pulseaudio was not working.

stephen@stephen-MS-7793:~$ gnome-alsamixer

** (gnome-alsamixer:2824): WARNING **: gam_toggle_get_state (). No idea what to do for mixer element "Auto-Mute Mode"!

** (gnome-alsamixer:2824): WARNING **: gam_toggle_get_state (). No idea what to do for mixer element "Input Source"!

** (gnome-alsamixer:2824): WARNING **: gam_toggle_get_state (). No idea what to do for mixer element "Input Source"!

** (gnome-alsamixer:2824): WARNING **: gam_toggle_get_state (). No idea what to do for mixer element "Loopback Mixing"!

(gnome-alsamixer:2824): GLib-CRITICAL **: Source ID 94 was not found when attempting to remove it
stephen@stephen-MS-7793:~$ wget -O alsa-info.sh http://www.alsa-project.org/alsa-info.sh && chmod +x ./alsa-info.sh && ./alsa-info.sh
--2017-02-25 02:04:23-- http://www.alsa-project.org/alsa-info.sh
Resolving www.alsa-project.org (www.alsa-project.org)... 77.48.224.243
Connecting to www.alsa-project.org (www.alsa-project.org)|77.48.224.243|:80... connected.
HTTP request sent, awaiting response... 302 Found
Location: http://git.alsa-project.org/?p=alsa-utils.git;a=blob_plain;f=alsa-info/alsa-info.sh [following]
--2017-02-25 02:04:23-- http://git.alsa-project.org/?p=alsa-utils.git;a=blob_plain;f=alsa-info/alsa-info.sh
Resolving git.alsa-project.org (git.alsa-project.org)... 77.48.224.243
Connecting to git.alsa-project.org (git.alsa-project.org)|77.48.224.243|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [application/x-sh]
Saving to: ‘alsa-info.sh’

alsa-info.sh [ <=> ] 28.03K 164KB/s in 0.2s

2017-02-25 02:04:24 (164 KB/s) - ‘alsa-info.sh’ saved [28707]

ALSA Information Script v 0.4.64
--------------------------------

This script visits the following commands/files to collect diagnostic
information about your ALSA installation and sound related hardware.

  dmesg
  lspci
  lsmod
  aplay
  amixer
  alsactl
  /proc/asound/
  /sys/class/sound/
  ~/.asoundrc (etc.)

See './alsa-info.sh --help' for command line options.

Automatically upload ALSA information to www.alsa-project.org? [y/N] : y
Uploading information to www.alsa-project.org ... Done!

Your ALSA information is located at http://www.alsa-project.org/db/?f=6df6aa1a778ffd6016143a1dfe7a0359d3c03d85

Please inform the person helping you.