MIDI Clock out from Studio One to Mother 32 - they're not talking!!

Hi Folks, the brick wall and my head have had enough of their current punch-up and I could really do with some help from someone who uses Studio One 4!
I have an Audiobox iTwo as my audio interface connected to Studio One 4 and I want to control the rate of the Mother 32's built in sequencer. I have connected a 5 pin MIDI cable from the OUT Din socket of the Audiobox to the Mother 32.
I CAN run a sequence from within Studio One and have it play perfectly on the Mother 32 at the rate set within Studio One 4 and the audio is recordable in Studio One so, that part of the MIDI equation is working fine.
However, if I want to use Studio One as my Master Clock and play a sequence on the Mother 32's built in sequencer, I get a random sequencer rate! To prove that this was not a Mother 32 setup problem, I tried the same connection to my Subharmonicon with exactly the same failed result :shocked:
Can anyone PLEASE give me a chapter and verse explanation of how I should set this up?
Any advice would be greatly appreciated.
Thanks.....
I have an Audiobox iTwo as my audio interface connected to Studio One 4 and I want to control the rate of the Mother 32's built in sequencer. I have connected a 5 pin MIDI cable from the OUT Din socket of the Audiobox to the Mother 32.
I CAN run a sequence from within Studio One and have it play perfectly on the Mother 32 at the rate set within Studio One 4 and the audio is recordable in Studio One so, that part of the MIDI equation is working fine.
However, if I want to use Studio One as my Master Clock and play a sequence on the Mother 32's built in sequencer, I get a random sequencer rate! To prove that this was not a Mother 32 setup problem, I tried the same connection to my Subharmonicon with exactly the same failed result :shocked:
Can anyone PLEASE give me a chapter and verse explanation of how I should set this up?
Any advice would be greatly appreciated.
Thanks.....