Comment by kazinator

Over the weekend I finished a kind of hardware project: I added a three-way switch to my ADA MP-1 guitar preamp [1987], mounted on the side panel, which selects one of three different center frequencies for the OD1 drive filter (enabled in "tube dist" mode). Really enjoying the treble boosted setting: "frown curve" centered on 3.2 kHz. It produces a tight, punchy, clearly articulated tone that is heard well in a mix.