The Zoom B2 FOUR amp and effects emulator is powered with multi-layer IR technology and six iconic DI models. It's never been easier to craft the perfect low-end tone. Build patches from 104 effects, including models of famous boutique effects and preamps, or mix and match up to five effects and amps simultaneously to build your own custom patches. Preloaded with 250 presets, these patches are designed to give bassists the ability to recreate the sound of popular songs from the '50s to today.