Ha-ha, good morning, everybody's fine ... I hope.
I think there's a mash up of ODB, as in Olde Dirty Bass ... and ODB-3, as in Boss ODB-3, because @johnk_10 ansered @socialleper question about the Boss ODB-3 with a description of something Fulltone (the ODB). I might be mistaken as ususal though .... How the then CTG came into all this, who knows.
Anyway, the filter knob of the Boss thing is on the clean only and it is very subtle own it's own and barely noticable in the mix of the pedal. If you want to hear it, or try to hear it, turn the dirt down an listen to the clean signal only. I was the guy asking about this and yes, Nick mentioned doubling up a cap.
Switches, not toally sure, but:
Bypass switch is a (partial?) tone bypass, which makes it louder, yes.
Mids switch I don't recall, probably shifts mids within the 3-band tone control, but no idea about frequencies.