Thanks for your help! No, I got distracted getting my Fantom's USB connection working. Last night I installed Roland's v1.0.1 driver and everything worked with Apple Logic Pro X, but have since encountered other problems (sometimes I get the Fantom's audio in and out of Logic; sometimes I don't). Also, I just tried controlling my Korg Kronos (the 88's hammer-action is too heavy for synth work) with my Nektar LX25+ MIDI controller via USB with no luck.
Tonight I'm going to try to follow your advice and again attempt to sync my Kong's tempo and arps to my Fantom G, using the Korg as the master MIDI clock. I think I plan to use my Fantom's built-in recorder for a while since I'm having so many issues trying to get my hardware synths and AU libraries to work in Logic with an external MIDI controller. Apple Logic is really, really cool, but so far, software DAWs are just far too too much hassle.