As you know you don’t need any Drivers for Audio in Ubuntu OS,but the fact that many doesn’t know is you can install own sound-card and change the Master volumes for MIC,Headphone,Line etc via terminal.The Good thing is you don’t need to install a software for this,it is a default software which comes with Ubuntu .
Type this in your Terminal
This software loads inside the terminal so you can control everything via keyboard.(see the screenshots)
To select a Sound card press F6
Workaround and explore you will find awesomeness of Linux.