Although it's an overdrive, it distorts heavily when the gain is increased. When the gain is increased to around 2 o'clock, a high-pitched squealing sound enters, and feedback at the same frequency also becomes more likely. It seems like it can be prevented to some extent by rolling off the tone. The characteristics of the pickups seem to greatly influence this aspect. For implementation on an effects board, Velcro (hook side) is attached to the back.