Well, no light has been shed here so I’ll summarize responses to my support ticket and what I’ve been able to figure out. The short answer is that it’s not possible to add articulations to a user instrument which uses only one’s own samples. There is a work-around posted here which works as long as you’re not trying to create functioning hihat with your own samples. Take an existing SD3 instrument and stack all articulations with your own samples, then mute the SD3 samples. This works well enough until you want a hihat, then your closed pedal stack fails to choke the open hihat stack. Importing my own samples was the reason I upgraded so this limited use (no multiple articulations, no velocity layers, no choke) is disappointing.
