Hi robbmonn-
Glad you're digging the H910.
Unfortunately, the H910 doesn't have the ability to precisely dial in micropitch intervals. The reason the Pitch Shift knob's precision is limited is because this is how the display was on the old hardware H910 unit (as well as the plug-in ratio display). Like a real analog potentiometer, the Pitch Shift knob does have better precision than what the display is – which you can access by command-clicking, and tuning by ear.
Now, I believe that these Micropitch shift presets were created by editing the values in the preset files themselves, to a higher precision. You could hook up Ableton's LFO or Envelope modulators to the Pitch Ratio parameter, and modulate between a ratio of 1.00 and 1.01, for instance. The modulation would still go through ranges in between those values, though you wouldn't see it visually. I realize this isn't ideal, but when creating the H910 product, we wanted to be as faithful to the original (quirky) hardware unit as possible.
Best,
Tom
