Sooooo guess what. I was like screw it I won't have the ground control set up the way I want. So I connected the channel 1 cable to the gcx, activated the preset and it was good. Then I plug in channel 3 to the gcx, it was working as well. I was feeling confidant, so I plugged in channel 2 one last time, guess what? It worked!!! I have no idea what the hell has been going on for the past 3-4 weeks with this thing, I'm assuming that for whatever reason, the ground control/gcx just didn't want me to program everything with all connections on the gcx plugged in. This is crazy!!! GCX and Ground Control and Triple Rectifier are working perfectly, the way I've been trying to get it to work all this time!!!
By the way, Channel 2 was never on momentary, none of my mesa channels were, just once when I was trying different combinations of settings to figure out how to get it working. John, I feel like I owe you a bottle of rum for troubleshooting this with me.
No other cables or connections from the mesa to the gcx.
GCX was brand new, same for the ground control.
I'm so happy this thing is working now!!!!