What is “shntool” Package?

Multi-purpose tool for manipulating and analyzing WAV files
For more details: http://etree.org/shnutils/shntool/

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

• Install shntool.

  brew install shntool

Now, use shntool!