Sorry, but I will not correspond through email. This is a SD-1 style circuit modified for control of bass response. Pedal is cosmetically in excellent condition with original box, however the LED for the “bump” function stays lit whether the function is engaged or not, thus the low price of the pedal. Bump function still does what it is supposed to do (boosts low and mid frequencies) and will, in fact, go on or off with pressing of the button. Again, I will not respond to email. Call or text Adam at (907)691-636three.