The Big Bloom is an overdrive preamp designed to capture the touch-sensitive harmonic richness and sustain of legendary D-style amplifiers. Its circuit is based on the rare and highly sought-after Japanese Shin's Music Dumbloid pedal, offering a complex mid-range "honk" and smooth, singing distortion. The pedal features a signature Rock/Jazz toggle that alters the EQ structure and gain staging to suit different playing styles. At higher gain settings, it produces controlled feedback and blooming harmonics that respond dynamically to pick attack. Each unit is hand-built in the USA, often featuring unique aesthetic touches like suede or tolex coverings.