Installation steps for aacgain

Package Information:

Name: aacgain
Use: AAC-supporting version of mp3gain
URL: http://aacgain.altosdesign.com/

Installation Steps:

1. Open Terminal using Spotlight search by pressing <command+space>. Type terminal and hit Enter key.
2. Now, run

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

3. Install aacgain using brew

   brew install aacgain

aacgain is ready to use now!