Thanks for the reply. I took a chance a just copied the wipe code into MatterControl, replacing the relevant section. Seems to work just fine. I'd be more comfortable if the bed didn't shoot so far forward, as the first tip *just* touches the wipe pad, but I'll worry about tweaking that later.
The Y axis for the 2nd extruder was "-50" (*minus* being the key), and seems to be working fine after a couple of test prints. It's weird thinking about how the numbers will be interpreted, but fortunately everyone seems to follow the same co-ordinates, so the dual extruder calibration steps for the TAZ 6 seemed to work just fine in MatterControl.
I did see the Printer Profile Bounty. Not sure that I would have any *significant* tweaking to qualify, but I'll keep it in mind.
As an aside, love the "Preheat" buttons!