S4 is semi-modular, enabling you to configure a control surface with up to three Channel Strip Modules (for 8, 16, or 24 faders, depending on configuration), four Display Modules, and up to three optional modules for your workflow needs. Core components that come with all Avid S4 configurations include the S4 Frame, Master Touch Module, Channel Strip Module, and Automation Module. The fully integrated Channel Strip Module and preassembled frame streamline configuration and setup, so you'll be up and running quickly.