Install aumix by entering the following commands in the terminal:
sudo apt update sudo apt install aumix
Simple text-based mixer control program
aumix is a small, easy-to-use program to control the mixer of your sound card. It runs in text mode using the ncurses library, or from the command line (non-interactively). It can read default settings from a file, and it can also automatically save and restore the mixer settings at shutdown and boot. . A wrapper script xaumix is provided that finds and invokes xterm or a replacement. This is primarily for creating the best sized terminal window. If you want a true graphical interface, install aumix-gtk instead. That has the same functionality as this one in addition to offering a nice X GUI.