Wow, I can’t believe you have not received any responses for this question. Yes, the Helix can control the H9, there are videos on youtube particularly this one: https://www.youtube.com/watch?v=hVKeDCX_VQc&feature=youtu.be ; The issue is that the MIDI implementation is not all there yet. There are a few glaring holes like no time sync or the capability to assign more than one MIDI command to a footswitch. I am sure these issues will be addressed soon.
Thanks for your reply! In the end I didnt buy a Helix just yet, its price is out of order. I reckon its got some hype attached to it. The price went up 400aud overnight in Australia. I ve got a Boss ES 5 coming as we speak, that ll do. I ll probably come back with some questions once I receive that. Im a MIDI virgin.