Presently in my band I receive midi clock from a master source and that goes into my Mininova via DIN. I'd like to add a Circuit to my setup but I'd need the MIDI clock I'm receiving to go into the Circuit, then out to the Mininova via the DIN out. I will sometimes be playing the Nova directly and sometimes from the Circuit (I'm a bloody awful keyboard player) to take advantage of the scales mode. What I've found with other solutions (such as an iPad, iRig and apps) is that I can send midi note data to my Mininova but not clock, even if the other device is receiving clock.
tl;dr does MIDI clock received by the Circuit go out to instruments down the chain, regardless of whether I'm using it as a controller/sequencer or not, because if so I'll buy one!