The Carl Martin HOT DRIVE'N BOOST effector, which realizes a variety of tones. - Brand: Carl Martin - Model Name: HOT DRIVE'N BOOST - Type: Booster - Power Supply: 115V 50/60Hz - Connections: Input, Output - Controls: BOOST, LEVEL, WAVE, GAIN Thank you for viewing. I bought this at a musical instrument store about 30 years ago and used it. It's a distortion booster that I connected to the pre-amp I listed at the same time. Carl Martin seems to have a refined sound, not a rough one. You can control the tone with the WAVE knob, so it's a booster that can slightly change the atmosphere of the sound. The operation is smooth, with no noise or scratchiness, and the sound is still as it was before. Some people may feel it's lacking because it has a sound without any quirks, but how about using it in a way that doesn't interfere with the song? The included accessories are the cables that were connected to other effectors. It's a high-quality sound made in Denmark. Please consider it. Type... Electric Guitar