I can’t find any more detailed specs at the moment, but Twister has a hi-res mode:
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Encoder Fine Adjust: In this mode, hold down or press a knob, and it becomes high-resolution . This allows you to control a tiny range of values with bigger movements. It’s ideal for precise adjustments to controls like EQ, tempo, resonance, etc.
Edit — Apparently still 7bit. More an adjustment to how the turn of a knob works than actual data transmission.