OK, I have an Axe-FX Ultra and they cannot transmit MIDI clock, they CAN receive MIDI Clock.
I don't have an H8000 (one day… I hope),but I do have an Eclipse and the Eclipse DOES have MIDI clock transmit.
SO not sure of your routing, but the way I am planning to do this is 7pin MIDI from GCP to Eclipse MIDI OUT and MIDI Thru to the ins of the MIDI Merge box the out from the MIDI mergebox to the IN of the Axe-FX, then THRU to Space and then chain from then. here is the MIDI diagram. don't know if that helps??
http://farm6.static.flickr.com/5150/5615598957_06f69615d3_z.jpg
