Well here is the deal.. for me with a battery in it, it wasn't that great. It actually INCREASED thenoise when in bypass. all this radio and crap and then when switched on , as it would kill noise, i had a loud fizz. So what i did was put it in with the other effects powered off of the one spot adapter cable and it works as it is supposed to. It really cuts the noise..... best thing is, harmonics and sustianed notes don't die out , they decay almost completely naturally depending on the threshold. Also, there is no tone suck! It honestly sounds like it is not there. Very happy with it as long as the noise /interference does not come back. but i have a plexi clone which like all plexis hums a tad. Boost with a pedal and its annoying as hell. this kills that loud pedal hum and radio. Its great. Try one oout. I disliked the behringer NS-2 knock off. There was tone suck...bigtime!Search ISP decimator on youtbe, you'll see an excellent demo. just listen to it.