Midi Jack USB. Connect your pedal accessory (Expression Sustain or half-moon switch) configure it using the display and the buttons and have it converted to MIDI messages. Has standard DIN5 MIDI input and output supports POWER-over-MIDI. Great with those keyboards that do not have an expression pedal input. Can be used with organ for bass note tap by assigning a note event to trigger with a standard sustain pedal. Or can be used in conjunction with an Half-Moon switch (Crumar Hammond Nord or vintage) to switch the speeds of a rotary effect simulator. Can be reprogrammed to act as a MIDI event processor.