"k25 series” 2.5cm Kosmo Utilities

Something you could try if you’re up for a bit of kludging is to add a diode and resistor immediately after U1B (before R11):
image

In my simulation, without the diode the voltage does tend to 0 V but very slowly; after 5 seconds (with both pots in the middle) it’s still about 100 mV. With the diode it’s about 2 mV.

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