Safe to connect to GCX via MIDI?

I want to connect my MC6 Mk2 to a Voodoo Labs GCX switcher that outputs power on pins 1 and 3 (for the voodoo labs Ground Control footswitch). Can the MC6 Mk2 safely be attached to the GCX with a 5 pin midi cable?


From the GCX manual-
“Warning: The PEDAL IN jack on the GCX is not a standard MIDI In. It utilizes the two
normally unused pins to provide 9 volts A.C. power for the Ground Control. Before connecting
to a device other than the Ground Control, you must either use a cable without pins 1 and 3
wired, or verify that the MIDI Out of that device conforms to the MIDI specification which
states that pins 1 and 3 are unconnected. Failure to do so can result in severe damage to your
equipment. If you have any questions about this, please contact Digital Music Corporation’s
customer service department.”