DD-6 wet and dry OR gate... I think, help!

[tripitacha]

Hi, I got a DD-6 for crimbo. YAS! Anyway, I want to use the hold function in such a way that when a loop is playing, the guitar stops. What I need is something that can do this:

The pedal has two outputs, one wet and one dry, I want to channel them to one output so that when dry is playing, dry comes out the amp, but when a wet signal occurs, the dry is switched off and wet comes through the amp, until the wet signal is off, then the dry signal resumes.

Any ideas of a little additional box I can put in my effects chain? Any circut diagrams I can attempt?

Cheers!!

[tripitacha]

I think what I basically need is an "IF/THEN/ELSE" circut, IF wet THEN switch off dry ELSE dry...

help!