Behringer UO300

Cheap choice for octaving down a guitar, but if signal is low in dynamic it do not process correctly, in fact some times the sound, due to harmonic, is a little confused and the pedal fails. Three fixed modes allow you to change type of sounds, filtering output with different frequency cut. When I used for the first time noise was disturbing, only trying different ac/dc adapters in different chains I was able to find the right setup to clean it, anyway, for terrific price, is a good pedal. If you are a little, only a little, competent in electronic you can take this product, being realistic about possible problems with noise, problems solvable trying different adapters or different chains. If you want a real plug 'n play device that works in every ac/dc state go to other brand.