alsamixer
ffmpeg
lame
mp3check
MusicBrainz Picard
PulseAudio
sox
Bitrate
Change Bitrate
Convert AAC to MP3
Convert AC3 to MP3
Convert FLAC to MP3
Convert MP4 to MP3
Convert OGG to MP3
Convert WAV to MP3
Convert WMA to MP3
Enabling mic to work for Skype
Test Microphone
Recording audio from the command line
Troubleshooting
Change the volume
Fix mp3 files
Get MP3 File Encoding Specs
Introduction to mp3
mp3 best practice
mp3 tags
Playlists
Set Default Sound Card To Use
http://www.mp3-tech.org/
http://lame.sourceforge.net/links.php
http://stefaanlippens.net/audio_conversion_cheat_sheet/
https://help.ubuntu.com/community/SoundTroubleshootingProcedure
https://itsfoss.com/fix-sound-ubuntu-1304-quick-tip/