Set the volume to 75% on the default sink

A simple command-line mixer for PulseAudio.
More information: <https://github.com/cdemoulins/pamixer>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

pamixer --set-volume {{75}}

click the source code to copy install pamixer on any operating system with command-not-found.com