The Bose® GPIO card II for card-frame ControlSpace® engineered sound processors is used to expand the number of standard general purpose input/output ports. This card inserts into the available GPIO slot and augments the pre-installed GPIO card by adding eight additional control inputs and eight additional control outputs. Each input is configurable to allow external control from hardware such as potentiometers (to control gain) and switches/contact closures (to select block states or invoke parameter sets). Outputs can be used to trigger digital equipment or used directly with LEDs and relays