I use a small 2 channel acoustic amp as a mini PA on occasions and take 2 mics for an acoustic sound or 1 mic and plug the guitar in. When I use 2 mics the impedance doesn't match on that channel so this just fixes the problem in one fell swoop. No extra noise or leads, just plug it into the 1/4" input on the amp and plug my mic into the adapter and Bob's your uncle. really pleased with this unit, just sits in the case/bag till I need it. Well worth the investment.