When I attach a Chase Bliss Gravitas directly to my midi controller with a cable made to the attached specifications (and no other equipment is attached), the Gravitas executes every midi command sent to it as it should. When I place a Midi Solutions Quadra Thru between the two (as is required to provide midi to the rest of the chain)(and no other equipment is attached), the Gravitas does not respond to any of those same midi messages. If I then connect the MIDI IN of an M-Audio Uno to the Quadra Thru, then the Gravitas executes every midi command sent to it. If I then place the Quadra Thru, the Gravitas, and the Uno into my midi chain the Gravitas does not respond to any MIDI messages. What could be wrong? I've uploaded a video of this test below. Thank you.