of a wide variety of drum, cymbal, percussion or other instruments, or even vocal sounds. It is similar in concept to modern MIDI musical keyboard workstations or synthesizers especially in that any sound available within a given module can be assigned to any trigger plugged into the module. Most electronic drum modules come with a number of pre-programmed "kits" or "sets" - collections of drum kit voices assigned to specific triggers which emulate a traditional drum set (e.g., including drum and cymbal sounds). Many modules allow the player to save their own collections of sounds as additional kits and allow the player to recall them as desired. In effect, a single set of triggers may serve the same function as several traditional drum sets or collections of miscellaneous percussion instruments. Some modules may allow kits to be saved with labels such as: "rock kit", "jazz kit", and "hip-hop kit." Others simply assign a number to each saved kit. Modules may allow varying degrees of control over individual sounds such as the relative volume of each trigger input or add electronic effects such as reverb or other effects. Most manufacturers also include more eclectic sounds in their modules, such as sounds from well-known drum machines, plus a large variety of ethnic percussion instruments, industrial music sounds, handclaps, and general percussion instruments or even vocal sounds. Manufacturers of electronic drum modules such as Roland Corporation have often built unusual playable sounds into the sound banks of their electronic drum modules to showcase the capabilities of the technology. Electronic drum modules also provide advanced features such as the ability to drive digital samplers. When used in conjunction with an electronic or digital sampler, the sounds that can be played with a drum module are practically unlimited. A drum module could be used to make any type of musical or natural sounds, from a piano or violin to ocean waves or other sound effects. Nomenclature "Drum Brain" While manufacturers such as Roland use "Percussion Sound Module," such a term only describes a subset of the device's functions. "Drum brain" is a term used by drummers, equipment sellers, and other industry professionals to be more descriptive. The term "drum brain" is used to denote the fact that its primary function is to act as the central logic device within an electronic drum kit. Electronic drum modules vs. "drum machines" Furthermore, an electronic drum module is