"Retro Channel released two stompboxesяthe Fuzz and the Trouble Booster. The Fuzz uses Retro Channelуs proprietary technology to create a MkII-style fuzz, said to maintain the same tone regardless of temperature, time, or travel. The Fuzz has control knobs for both Level and Attack. The Trouble Booster is Retro Channelуs take on the famed Rangemaster treble boosterяwith some updated features including a Level control and a Slope control that allows guitarists to fine-tune the center frequency of the boost. "