I got this thing to use it with my bass... And so I never made it work.
I read info in their official website, watched youtube tutorials, I tried with a Warwick Rock Bass 5 Strings, Metal strings, and as well with a fretless nylon strings bass, and I even tried it with an electronic guitar, no result at all! The thing works, yes, it makes some sort of noise when I switch it off and on but it doesn't make the effect which it is intended to do, I guess it likes some basses only, they say it requires practice, but I can not make it sound nice at all not even for one second, I wasted my money on this b-shit. I don't advice it to anyone.