Provides a contact closure which can be programmed to open or close in response to 4 separate types of MIDI events: Note, Control Change, Program Change, or a System Exclusive event such as MIDI Show Control or Machine Control. A fast reed relay is used for response time of less than 2ms. Relay contact is rated at 500 mA. Connects through 1/4" jack. Relay is programmed via the Processors Programming Tools software and retains settings even after power is removed. The MIDI Solutions relay unit is MIDI powered and includes an indicator LED. 4.3 oz. 4-1/2"W x 2-1/2" x 1-1/4"D.