Chocolate Electronics Chocolate Booster This manufacturer won the grand prize in the 1st SPI DIY Effector Contest held in Shinko Music's magazine THE EFFECTOR book. It features a natural, expansive, and clear sound without compromising the character of guitars and pickups. Connecting it to the preamp of a vacuum tube amplifier allows for even more nuanced and dynamic drive tones. Setting the "Boost" knob to the minimum position allows it to be used like a buffer, and you can experience a sound several ranks higher, with no change in perceived volume, but with added sharpness and luster to the original sound. The adoption of low-impedance output also makes it less susceptible to sound quality changes and noise even when using long cables. The power supply supports batteries and 9V-18V AC adapters. Of course, we have confirmed that the operation is smooth and there are no problems! Thank you!