Drum Module, Sound, Electronic Drum Module. Drum Module (or drum brain) is a device that serves as the central processing unit and sound module in an electronic drum kit. Drum module interprets electronic signals from the triggers on a drum kit and translates them into audible drum sounds. Modern drum module usually emulates a wide variety of acoustic drum kits and other percussive instruments. Drum Module can also provide advanced features like the ability to drive digital samplers (Roland Drum Module). If samplers are synchronized with Drum Module, the sounds that can be played are limitless.