 Digital instruments typically discourage users from experimentation, due to their lack of the feedback and direct control that switches and knobs would provide, but patch editors give owners of hardware instruments and effects devices the same editing functionality that is available to users of software synthesizers.Some editors are designed for a specific instrument or effects device, while other, "universal" editors support a variety of equipment, and ideally can control the parameters of every device in a setup through the use of System Exclusive commands.Patch librarians have the specialized function of organizing the sounds in a collection of equipment, and allow transmission of entire banks of sounds between an instrument and a computer.