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With regards to the circuit diagram, I'm a little confused with U2. U1 and 3 appear to be Pins 1-3 and 5-7 of the Op-Amp but U2 looks like a Pot. Is it a 10K pot?
R2 and R4 are pots. Does the values in black imply the resitance setting for these pots?
Cheers
David