Letâ€™s let Boss tell the story of this one in their own wordsâ€¦
â€�BOSSâ€™s COSM Acoustic-Modeling technology is beautifully showcased in this small but powerful pedal, which simulates an acoustic guitar much more precisely and realistically than previous technology allowed. Derived from BOSS top-of-the-line AD-8, the AC-3 simulates the sound of an acoustic guitar with incredible precision. Four simulation modes are provided: Standard, Jumbo, Enhanced, and Piezo-equipped; the latter supplies that famous "cut through the mix" direct piezo sound. Previous compact acoustic-guitar modeling-pedals were promising, but now the bar has been raised with AC-3. Top and Body controls are provided for shaping the characteristics of the four acoustic models. Create the perfect acoustic-guitar sound quickly and easily with simple knob twists, or add depth and space to the sound with the AC-3's built in digital reverb. It's like getting two pedals in one.â€�
Two sets of outputs are provided for connecting the AC-3 to a standard guitar amp and to a direct input device such as a PA, recorder, or an acoustic-guitar amp configuration such as a Roland AC-60.