Very useful pedal if you have a few ballads in the setlist, but do not want to carry a second guitar to gigs. The AC‑2 simulates the sound of an acoustic guitar and also offers various adjustment options.
Here’s what Boss themselves have to say about this pedal:
“This unrivaled floor pedal makes your electric guitar sound like an acoustic. Using four separately switchable modes, you create a wide variety of simulated acoustic guitar sounds. Conveniently switch between an acoustic and your electric sound with the foot switch.”
The controls are: Level, Body, Top as well as the selector switch for the 4 modes Standard, Jumbo, Enhanced (more attack) and Piezo.
There is an additional output for the original electric guitar signal. It is important to note that you switch between the two outputs with the footswitch. This way you can connect different amps for electric and acoustic guitar sound.