John Larkin wrote
This is pretty bad. The box doesn't work.

https://www.dropbox.com/s/cja04ohlsw...lenco.zip?dl=0

Strange, in
https://www.dropbox.com/s/cja04ohlsw...o_CS-440_5.JPG
I see a position marked as R5 with a capacitor in it...
Maybe they use the same board for resistor bank and capacitor bank?

It is a good argument (the other pics) to use flexible wires from switches etc to the PCB,
not use PCB mounted / soldered user controls.
After some switch rotations the solder joints will make bad contact.