Product Description ● This is a self-made unit using a universal board and completely hand-wired, based on the circuit of the vintage Maestro Brassmaster effector. ● Compared in a studio with a real Maestro unit and the popular Mareco B:assmaster replica, this unit's sound is almost identical to the Maestro. (The Mareco has more low frequencies, while the Maestro has more upper octave components.) ● The knobs are, from left to right: BrassVol, Sensitivity, and BassVol. The toggle switches are, from left to right: BASS mode switch, and Harm switch. ● Made with hand wiring on a universal board. ● 9V battery operation is OK. ● A 9V center-negative adapter can be used. ● A φ5mm high-brightness blue LED is used. ● True bypass. ● The aluminum case size is 92 x 119 x 34 (height) mm. ※ Returns are not accepted except for initial operational defects. ※ If you want the exact same sound, we recommend purchasing the original unit. ● EBK is a name used only for auctions. In our main business, we specialize in blues-related equipment, including the adjustment and production of amplifiers and effectors, as well as guitar adjustments. We have produced over 4000 units (as of August 2024), and many professional musicians use our products. ● Six-month warranty: We manage customer records, so if a failure occurs during normal use, we will compare it with the shipping records and repair it free of charge within six months. (However, you will be responsible for the shipping costs.) ● Price includes shipping.