The Laohu says:
That Y command tip was a good one, Alex, thanks again! It not only keeps the Slim Phatty on the setting it should be but also allows me to switch settings without touching it, which means one less thing I have to keep track of during my live performance. Eventually I'll try a midi Thru to see if it helps with the errant notes, but the result is much more tolerable right now.
Another interesting point, tho, is that the Slim Phatty is the only device affected by the junk Program Changes. The Animoog and Drum Machine never seem to have any troubles.