This is the low-gain model of YUKI's 3OD, which n-buna of Yorushika also used. Although it's a low-gain model, it distorts quite a bit when you increase the Gain. I used it for lead guitar, but since it seems to be designed for guitar vocalists, I think it's recommended for both lead and backing players. Operation has been confirmed. No box or manual. It's a great pedal, and I really don't want to sell it, but I'm reluctantly listing it to organize my equipment. It's not often seen on the market, and I don't know the going price, so this is a tentative price. Feel free to ask any questions about price reduction or condition, etc.