Heh. We talked about doing a "Layout advent calendar" for you all. Mark started on the 1st of december with Landgraff M'OD, and i'm continuing with another Escobedo circuit - The Gargletron. Original sample of the sound can be heard here.
From Tim Escobedo:
"Talking" type effect, two parallel MFB filters tuned by a single 10K pot. Similar to EH Talking Pedal and Craig Anderton's Wah/Anti-Wah design. Gives good wovel sounds.