MIDI to GPO
Output: 6.3mm phonejack, switch over contact 0,5A/40V
Static and puls functions are available
LED-indicator for contact-state
One out of sixteen MIDI events selectable
MIDI events: Notes, Controlchanges, Start/Stop, MMC,
Programchanges, O2R SysEx
MIDI In ( Softthru )

The complete Operating Instructions
and the 16 tables of GPO are here ( PDF )