How Do I Control 8 Speakers Individually

Hi, Is there any way I can control 8 different speakers individually? I would like to be able to fade audio from one speaker, increase audio on the second, fade the 2nd while increasing audio on the 3rd, etc. My objective is to use audio to create movement around a 100 ft by 60 ft courtyard. My purpose is to use this in a lightshow at a haunted house I am trying to build. I know that you can use a quad amp for 4 speakers. What kind of equipment would I need? Help!! Thanks Mick