quick and dirty audio amp?

Linux for blind general discussion blinux-list at redhat.com
Tue Jul 10 18:01:03 UTC 2018

I would like sometimes to use my pc to amplify audio; my hearing is very porr.
I would like to just have the mic or line-in amplified and come to my headphones.
I used to know how to do this but cannot remember.
Can you suggest the easiest way using command-line command?
Ubuntu 16.04lts, x86/64 with alsa and many audio programs on there.

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