The main dirt circuit of the Giant Hogweed uses a single op amp in a topology similar to a RAT. A secondary octave up/down circuit can be switched on and will be mixed with your dry signal before hitting the gain stage. The individual volume controls for the octaves define how much (if any) of each gets mixed in. The Texture control allows to mis-bias the chip and introduce gated sounds and texture. This imbalance of headroom also allows to clean up the dirt with the guitars volume control, even with buffered pedals before it, so it can be placed pretty much anywhere in the signal chain.
Demo by Ed Pettersen (EN)
Official Product Video (EN)
All Drolo Pedals