The great sound is due to the new-old-stock east-german germanium transistors. Very characteristic for the module´s sound if the feedback that is coupled to the feedback. The more fuzz, the more feedback - the Strakal Brulu 2 can get pretty nasty and it screams a lot at high fuzz settings and low input level. The fuzz amount can be voltage controlled, with an inverse attenuator.
Input and output levels can be set separately and especially the input level affects the Strakal Brulu 2´s behavior a lot.