IK Multimedia iRig Keys 2 Mini 25-Mini-Key USB MIDI Keyboard Controller - Manual (Page 7)

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4. If needed, connect a footswitch/expression pedal to the TRS connector on iRig Keys 2 (not for Mini).
5. To play MIDI compatible apps from an external controller, use the included MIDI cable adapter and a
standard MIDI cable (not included) to connect your controller’s MIDI OUT port to iRig Keys 2’s MIDI IN port.
MIDI IN