Try this: use a pedal with your GControl, not its switches. Assign a MIDI CC to the pedal and patch the same CC# to an Eclipse external # that you will then patch to FX A Bypass. You will see that when you rock the pedal in its midway the Eclipse will change Bypass status. As soon as the pedal falls below the mid position, Eclipse will change bypass status again.
If the GControl display can show the actual MIDI value, you will see that the trigger action is at 64.
I'm saying that any CC with value between 0 and 63 doesn't trigger anything. A value between 64 and 128 will trigger the event. So the triggering threshold is 63<>64.
A pedal would show this very clearly. I'm using a slider here, on a desktop MIDI controller.
best
I