Caroline Guitar Company Icarus Boost V2.1 up to +12db of clean boost with no additional gain just from the second (volume) stage, but once you add that gain and start to clip the hybrid Russian germanium and silicon diode circuit, you won't want to come back. The pedal is Based on the acclaimed preamp from the Parabola and Météore, but the Icarus expands on it with the multiple gain stages, gently tapered highs control, and buffered/true bypass. All running elegantly at 9VDC .