Zoom A3 Pre-Amp and Effects for Acoustic Guitar Easy-to-use interface includes LCD, footswitches, analog-style cursor keys/parameter knobs and LED indicators Remodeling presets for 16 body types and 28 popular acoustic guitar models 40 effects can be used in any combination Acoustic guitar pre-amp with Mic and Pickup mixing options, 3-band EQ, Balance control and super-low noise design AC (adapter included) and USB bus powered