Firefly audio simulation troubleshoot

Good day all. I am researching on my project on how sound waves could produce architectural forms. I am particularly interested in a plugin called firefly to produce sound simulations. However, I cannot seem to include the frequency spectrum into grasshopper using rhino 6. Is there anyone who could please assist me on how to access the audio components of the firefly plugin. I have downloaded the latest version from Food4rhino and inputted the plugins into “Files>>Special folders>>components”.
Any advice will be appreciated.

Kind regards