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I have no experience with the Grandmother, but on page 38 in the manual it says:

"KB OUT RANGE - The voltage range of Grandmother’s KB OUT (pitch CV) jack can be either -5 to +5 Volts, or 0 to 10 Volts. To adjust the KB OUT Range setting, press the (C#2) key, and then use the first two white keys to select -5V to +5V (F0), or 0V to 10V (G0). The Default is -5V to +5V."

So it looks like you can set the KB OUT to the 0-10V range, which works better with Plaits.