OSX users can use either the PortAudio (default),auhal(or coreaudio), or the Jack realtime audio modules. The auhal module is a native OSX module which provides good latency, but it might not work with some external hardware. To know more : https://csound.com/docs/manual/RealTimeMac.html

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 csound using brew
   brew install csound

csound is ready to use now!