How to get KeyStep pitch to work with microGranny?

Hi, I am having lots of fun with my friends’ OP-Z and other equipment! One thing I want to figure out is how to get the Arturia KeyStep’s pitch control to work with Bastl microGranny samples over MIDI. The Mod control works, adding modulation to my samples. But the pitch control doesn’t seem to do anything.

Am I missing some obvious field in the MIDI Control Center?