Gold said:All four of the bell sections are the same except for the component values. The low mid sections should behave the same way as the other bands.
I’ve gotten behavior like that when I’ve miswired a switch or two. I’d compare the low mid sections to a working section. Double check component values and connections.
Good point, I’m taking it out of the case tonight and will check my wiring, it’s entirely possible I made the same error twice ;D
EDIT: Had a 100K resistor at R100 on both boards, switch it to 10K per the schematic and now everything is working as it should! What a great EQ!