Good reverb effects for price, but installing 9 volt battery is very difficult, if youre not careful you will break plastic tabs that holds cover, I would highly recommend using power adapter

My violin sounds fuller & sweeter & even more powerful (than just the pick up & amp).DEFINITELY BUY THE 9v POWERED ADAPTER, so you don't go thru batteries

Great for standard tuned guitars, but even drop D tuning I lost a lot of the bassy tones