Levey,
O k, you are better off than I thought..especially since you already have a mixing console
All you really need is the midi interface...as I mentioned before I have a parallel interface and a Usb...I am /was not expieriencing any audible latency with the Usb interface..im using the parallel interface simply because it has more ins and outs..although i do remember that one of the 4in 4 out Usb interfaces was kinda buggy and I believe it was the Midiman version but that was a while ago...I would recommend any of the Motu stuff...solid as a rock
On the matter of smpte..you dont really need it for what you are trying to do with your external synths/sound...you can simply use Midi Sync within Cubase..to sync the Triton and any other midi sound modules you have...you dont need word clock or a midi time piece for this
I recommended getting an interface with smpte so that if you ever wanted to sync analog tape decks to your setup you would have a means of "striping the tape". Again, most midi interfaces that have 4 or more ins and outs have smpte capabilities...
You mentioned using the triton to drive your sound modules..
This would be o k...if you have already created your sequences within the Triton...if not...a better alternative would be to dump all of your sequences in Cubase..and let it be the main sequencer . You could still use the Triton, the kurzweil and the drum machine to create your sequences but use Cubase as your main recorder..
Make sense?...
Hope this helps