I've been playing with the notch feature on the D2. One of the big issues I had with the Deus 1 was the great tones I would get on small pieces of tin from decomposed cans. The Deus 2 is less susceptible to the false identification but the pieces clutter up the sound in my old sites. Watching other people use notch with great success I've started using it myself. I run the fast as the base program with discrim at 6.8 then notch from 7-50. I'm very happy with the results and investigate any tones that come through. Silencer at 1.