Jet Revelation Reverb V2.0 - Why is my Revelation not responding to MIDI messages?

FAQ
Currently there are multiple types of wiring options for cables and connectors. We comply to the
MIDI specifications for TRS standards, meaning the tip is active, the ring requires 5 volts and the
sleeve is grounded. It is likely that the cable you're using does not meet these standards. Please
contact us for recommendations on cables.
Why is my Revelation not
responding to MIDI
messages?