i have the very same problem...it's from the lfo for sure..i've build 2 different boards of the wampler analog echo+dirtbaby modboard. when i boxed it, i had that ticking even in bypass. playing with rate control made the ticking faster/slower... after moving the wires a bit, i found that when i was moving the in and out wires of the main board away from the daughter board, the ticking wasn't so bad..after that, i changed the route of my wiring, and now it's much better. it's still there, but you have to be quiet to here it...my dirtbaby on the other hand, didn't had any ticking...
i don't know...maybe it's the daughter board that causes all these..
i wish we could build something that will eliminate this problem...