Boss AD-2

Worth recommending

I like how the ambience effect on this one. You dont need a separate reverb when u have this gadget. It does give u a good acoustic feel. Im recommending this.

Does the job

This pre-amp does what it does. I use it with a Seymour Duncan Woody XL. Silent, not to hard, maybe even a bit "sluggish".

But it's a Boss. Little to complaint about. It even comes with a battery, so there is no reason not to work it as soon as it comes in.

Good thing when you need that little extra for recording as well as in a live setting.

great preamp for acoustic guitars. You should always use it with power supply cable, because a battery runs out very fast.

Adds Very Little

This is a well made and easy to use pedal, but the FX are so subtle that it is ultimately useless.

I tried using it with a nylon string ukulele and a Cherub external piezo pickup. It does, just barely, round off piezo screech, but adds nowhere near enough gain to properly drive an electric guitar amp.

Other effects: the "Ambience" (reverb) is OK, though noisy, but the "Acoustic Resonance" and the "Notch" filter seem to do bugger all.

So far, I have tried the L.R. Baggs Para Di (feedback hell and too expensive) and L.R. Baggs GigPro (great, but really, really difficult to change the batteries; you have to yank out the whole PCB!)

Conclusion: I've given up piezos, preamps, and all that malarkey, and gone back to using a mic.

Absolute must for piezo!

I have acoustic guitar & mandolin with piezos and always had a muffled sound when playing through amps. But this pedal brings back the resonance and acoustic sound. Really makes a difference!