The Sundance Electronics HI-1 Fuzz is an interesting take on the Harmonic Perculator-style fuzz, with just one gigantic Volume knob and three toggle switches providing tonal and gain variation in Mids (flat or slightly scooped), Compression (standard or more dynamic), and Gain (High/Mid settings).
Mixing and matching these options opens up a variety of tones, while the Volume knob delivers plenty of output.