Hello.
I tried to build an dod 250 clone, and all it gives out is a loud hum, it responds to a volume pot.
The circuit in question features ground for input and output.
My best guess is a short in somewhere on the pcb or i just don't understand the grounding very well.
Or a wiring error. Or any number of problems.
Familiarize yourself with this sticky thread (http://www.madbeanpedals.com/forum/index.php?topic=902.0), specifically jkokura's suggestions. Test continuity through your bypass switching. Test your IC voltages. And, please, post a link to the board and circuit you're working on. Good luck!
Thanks! Will do!